U4T3 练习题

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八年级U4T3知识点及练习仁爱版

Unit 4 Our worldTopic 3 The builders used live models, didn't they?一、语言知识点（1）单词：remain, government, wonder, live, treasure, underground, palace, west, king, ancient, pull, weigh, ton, pull down, worn out, be made up of, regard…as…（2）语法：1．反意疑问句及回答。

2．计量表达法。

（3）句子：1．Only a few of them remain now.2．People pulled lots of them down in the 1960s.3．Also some of them were worn out.4．We are doing our best to protect and rebuild the old city walls.5．The first emperor, Qin Shihuang, ordered his men to make them.6．It stands in New York.7．Do you know more information about it?8．It took about 100 000 people over 20 years to build it.9．The building is made up of two million stones.10．Each stone weighs more than two tons.11．The first emperor, Qin Shihuang, joined the old walls together.12．From then on, people regarded the Great Wall as a symbol of the Chinese nation.二、单词辨析和语法讲解1．反意疑问句（1）反意疑问句的定义：反意疑问句是附在陈述句之后，对陈述句所说的事实或观点提出疑问，因此也叫附加疑问句。

Uunit3-4测试

2013年秋季高二英语Unit3—Unit4检测试题命题人：张勤审题人：高二英语组（浠水县团陂高中）（10月21日晚自习7:10—9:10完成）第一卷（选择题部分满分100分）第一部分，听力（共两节，满分30分）做题时，先将答案标在试卷上，录音内容结束后，你将有两分钟的时间将你的答案转涂到客观题答题卡上。

第二部分：英语知识运用（共两节，满分45分）第一节：单项选择：（共10小题；每小题1分，满分10分）从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该题涂黑。

21. ---May I have a talk with one of your sports reports?---Sorry, but all of them are out to ____ the main events of the day.A. getB. findC. coverD. search22. The soldier was ____ of running away when the enemy attacked.A. scoldedB. chargedC. accusedD. punished23. Last night Mr Crook didn’t come back at the usual time. ____ ,he met some friendsand stayed out until midnight.A. MeanwhileB. HoweverC. InsteadD. Yet24. There are cases ____ speech has started late in a child who eventually turns out to be of highIQ (智商).A. whenB. whyC. whereD. as25. Lucy has ____ all of the goals she set for herself in high school and is ready for newchallenges at university.A. acquiredB. finishedC. concludedD. achieved26. The road was so narrow that I had to ____ myself against the wall to let them pass.A. pressB. defendC. pullD. prevent27. The naughty boy is ____ making noises when his sister is doing her homework.A. simplyB. constantlyC. graduallyD. generally28. ____ for power, the general made a plan to overthrow(颠覆) the government.A. AfraidB. FamousC. GreedyD. Popular29. In order to stop poverty, the World Bank has ____its focus to providing technicalassistance and long-term loans to developing countries.A. fixedB. exchangedC. transferredD. switched30. During the flight to the Moon, Chang’e I Satellite gradually ____ her directions sothat she can go into her programmed orbit.A. acceptsB. adoptsC. adaptsD. adjusts第二节：完形填空(共20小题；每小题1分，满分20分)阅读下面短文，掌握其大意，然后从31—50各题所给的四个选项(A，B，C，D)中，选出最佳选项，并在答题卡上将该项涂黑。

Unit 4 Topic 3 同步练习仁爱版英语八年级上册(含答案)

Unit4 topic3一、词汇练习(每小题2分，共30分)。

A. 根据句意及首字母提示填空。

1. I like movies. So I often visit movie w_______ online.2. We should make a p_______ project to solve the problem well.3. Our teacher often tells us to c_______ the wrong exercises in our homework.4. Li Lei’s mother was angry at the r_______ of Li Lei’s exam.5. I can remember the new English words, but I can’t understand the g_______.B．根据句意及汉语提示完成句子。

6. I am not sure if it is _______ (事实).7. My mother likes shopping _______ (在线).8. Do you know how an earthquake _______ (形成)?9. People can do many things _______ (通过) the Internet.10. Computers work by a special _______ (语言).C.用括号内所给单词的适当形式填空。

11. Vegetables are _______ (expensive) than usual near the new year.12. I have two _______ (dictionary). One is English-Chinese, the other is Chinese-English.13. I _______ (search) the whole room for my lost pen, but I couldn’t find it at all.14. This computer is _______ (cheap) of the three.15. Could you tell me some _______ (information) about Wenchuan earthquake?二、短语、句型练习（每题2分，共20分）。

上U4T3SectionB基础知识达标训练

SectionB 基础知识达标训练一、单项选择( ) 1. Many modem factories by computer, so their products are more excellent.A. mainly controlB. are main controllingC. are main controlledD. are mainly controlled( ) 2. He an honest man, but now he often tells lies to cheat others.A. was to beB. used to beC. used to beingD. was used to( ) 3. He that he knew nothing about computer, so he began to work hard at it.A. knowsB. knewC. realizeD. realized( ) 4. How to computers us better is an important task.A. make; to serveB. make; serveC. making; servingD. made; serving( ) 5. Brown made his mind work hard to learn computer technology.A. of; forB. up; forC. from; toD. up; to二、用that, which, who完成下列句子1. Spaceships is a vehicle are now mainly controlled by electronic.2. Liu Yang is an astronaut was the first woman astronaut to travel into space.3. This is the pen I used to write with, my grandfather gave to me.4. In all the places of interest, there are things tourists should not miss.5. Mr. Li is a man means what he says.三、阅读理解Do you know Weibo? Do you wri te a Weibo? If you don’t, you are “out”! Weibomeans microblog. People may spend much time writing a blog, but it takes a little time to write a microblog. Why? Because every message on a microblog is less than 140 words.Microblog started in the USA. It came to China in 2009 and it has developed very fast. In 2011, the number of Chinese microbloggers grew to 300 million. Now more and more people are interested in writing microblogs. For many microblog users, it is a great way of learning the freshest news, talking with friends and sharing different kinds of information, including news, daily life, pictures, music and so on. Many stars and famous people also write microblogs and share good things with their fans.It is easy and fast to send a message on a microblog. However, this can also lead to problems and even cause panic. For example, when the big earthquake and tsunami (海啸) hit Japan in March, 2011, messages like “Salt can protect people from radiation” were hot on microblogs. It soon caused a crazy buying of salt. Later people realized it was just a rumor(谣言).In a word, microblog plays a new role in the life of Chinese people.( ) 1. Weibo means in English.A. blogB. microC. microblogD. short message( ) 2. How many words are there in a message on a microblog?A. 150 words.B. Less than 150 words.C. Less than 140 words.D. More than 140 words.( ) 3. When did microblog come to China? Where did it started?A. 2009 in the USA.B. 2011 in China.C. 2011 in the USA.D. 2009 in China.( ) 4. When the big earthquake and tsunami hit Japan, what microblog caused a crazy buying of salt?A. Salt can protect people.B. Salt can protect people from radiation.C. Radiation is very terrible.D. Radiation is salt.( ) 5. The passage is mainly about .A. tsunamiB. earthquakeC. saltD. microblog参考答案：一、l. D2. B used to +动词原形，过去(常常)……。

仁爱英语八年级U4T3综合练习

Unit 4Topic 2综合练习一、单项选择1.We can get_______information on the Internet.A．much B．many C．a lot2.Maybe______is possible for everyone to use a computer in China in the future. A．this B．that C．it3.When you read English，you shouldn't________English________Chinese all the time. A．change；to B．change；into C．put；in4.I'm not good at math.Would you mind teaching me how_______it?A．to improve B．improving C．improve5.Some bad things may happen if students______too much time _______the Internet. A．spend；in B．pay；for C．spend；on6.--What about this one，Madam?—It's too expensive.Can you show me a________one?A．cheap B．cheaper C．expensive7.—Excuse me，what does this word mean?—Sorry，I don't know.Let's look it up in a_________.A．newspaper B．dictionary C．library8.My father used to________newspapers after meals.A．watch B．see C．read9.Pizza is much_________than bread.A．expensive B．more expensive C．most expensive10.I often________the Internet_______some information during my study. A．look；for B．search；for C．wait；for11.—What's wrong with your computer?—Oh，it doesn't_________.A．work B．move C．run12.There's something wrong with the plane，but it landed_________in the end. A．safe B．safely C．dangerously13.—I often see you_________in the park，why?—I'm too fat.I want to make myself .A．run；thinner B．to run；thin C．to run；thin14.—Can you tell me _______he will come or not?—Sure. ________he comes，I'll tell you.A．whether；Whether B．if；If C．whether；If15.The boy grows________and he is as tall as me now.A．taller and taller B．shorter and shorter C．tallest二、根据提示，完成句子1. —我可以和你交朋友吗?—当然可以。

人教版高中英语必修四unit3练习题.docx

Unit 3 A taste of English humour1.break: break down; break up ;break in; break out; break off; break away from①The theif _____ _____ the office and stole some money.②When I told them my story, they _____ ____ tears.③We may ____ _____ relations with that country.④Let’s____ _____ the projector into smaller parts in order to deal with them one by one.⑤The party ____ ____ at midnight.⑥I was in a nightclub in Brixton and a fight _____ _____.2. now : up to now; from now on; for now; now and then; now that①________, the work has been quite smooth.②_______ I will try to do better.③______ you have to go, take care!④He interpreted me _______, which made me crazy.3. cut: cut off; cut in; cut out; cut down; cut up; cut across①The young man has decided to ______ his long hair.②Then he ______ a field to go home.③Don’t_______while others speak.④When you give a speech, you’d better ________ unimportant details.⑤My uncle hasn’tbeen able to quit smoking, but at last he has _____.4. Thanks to his _____, he has made many friends although he move tothe new country for a short time.A. humour senseB. sense humourC. sense of humourD. a sense of humour5.Hot ____ the night air was, we slept deeply because we were so tired after the long journey.6.Those who are ____ their present situations will surely make no more advance in life.A. content toB. satisfied ofC. pleased toD. content to7.It is believed that if an event is ______, it will surely _____ the readers of the paper.A. astonished; astonishB. astonishing; be astonishedC.astonished; astonish D. astonished; be astonished8.The direct flight has proved successful, _____ Taiwan anothertourist destination for people on the mainland.9.In fact, most people in some developed countries are _____ than they were two years ago because of the global financial crisis.A. poorer offB. badly offC. worse offD. richer off10.Living in the dormitory means ______ to take care of yourself, understand each other’sdifferences and shares _____ interests.A. to learn; commonB. learning; ordinaryC. to learn; ordinaryD. learning; common11.用 entertain 的适当形式填空。

期末复习U4T3 test （Grade 8）

八年级上期末复习测试卷U4T3班级：_____姓名：___________ 座号：______成绩：__________Ⅰ. 按要求写出下列各词1. report (相对应的人) ___________2. begin(现在分词)____________3. dictionary（复数）___________4. cheap(反义词) e_______________5. pleasant (名词)______________Ⅱ. 从方框中选择正确的词，并用其适当形式填空1.I know my mother won’t believe this, but it’s __________.2.The Internet makes our life more interesting and ___________.3.When I passed by, I heard them _________ English songs.4.When we do eye exercises, we should keep your eyes _________.5.How to get there __________ is still a problem.Ⅲ. 词组1.面对面地_______________2.查找新单词__________________3.将它投入使用__________________4.与…不同____________________5.把…变成…__________________6.形成_____________________7.各种各样的______________8. 查明，弄清楚____________9. 提高你的听力技能_________________ 10.沉迷于…__________________ 11.推选他为校长__________________ 12. 对…确信______________ Ⅳ.翻译下列句子1.我确信现在你能在互联网上找到许多的信息。

初中英语U3-U4复习同步练习题(有答案)

U3( )1. — Is AC Milan Italian football club?—Yes. It’s one of most successful clubs in Italy.A. an; /B. an; theC. /; theD. /; /( )2. —Look! What’s that the corner of the room?—I can’t see clearly. It’s a little dark th ere.A. behindB. belowC. inD. under( )3. There are floors in the building and my home is on the floor.A. twenty; fifteenthB. twenty; fifteenC. twentieth; fifteenD. twentieth; fifteenth( )4. — What fruit would you like?— Some , please. They are my favorite.A. dessertB. grapesC. juiceD. biscuits( )5. — The Internet has made communication much more .— I agree. For example, I can communicate with my friends on WeChat any time.A. popularB. necessaryC. importantD. convenient( )6. — Whom would you for the job?—Tom, I think. He’s always careful and serious.A. suggestB. remindC. rememberD. explain( )7. —Was Eric’s father very strict with him?— Yes. He never praised him he became one of the top students in his grade.A. sinceB. whenC. untilD. because( )8. — Excuse me, could you tell me where I can buy some ?—Sure. There’s a post office at the first crossing.A. snacksB. stampsC. umbrellasD. bananas( )9. — Will you be a supermarket on your way home?— Yes, Walmart is just beside my home.A. looking forB. setting upC. fixing upD. passing by( )10. — Does my question sound enough?— I don’t think so. You can ask more by using “could” instead of “can”.A. politely; politelyB. politely; politeC. polite; politelyD. polite; polite( )11. —It’s not enough an English club. You should also read English newspapers and magazines often.— Thanks for your advice.A. joinB. to joinC. joiningD. to joining( )12. — You really went to the park last weekend?— Yes, I go there. Look! This is a photo of me in the park.A. willB. wouldC. doD. did( )13. — Are you going to Beijing for the summer holiday next week?—Yes. But I haven’t got the air tickets and don’t know we will set out.A. howB. WhereC. whenD. what( )14. —I don’t know next.—Let’s ask our teacher for help.A. what to doB. what should I doC. how to doD. how I should do( )15. — The game is too hard for me. I will certainly lose.—You never say no before you try.A. Forget it!B. I’m sorry.C. Come on!D. Pardon me?参考答案：1-5 BCABD 6-10 ACBDC 11-15 BDCACU4Ⅱ. 单项选择( ) 1. —Your mother plays tennis very often, doesn’t she?—Well, she doesn’t like it now. But she .A. wanted toB. would like toC. used toD. hoped to( ) 2. —I am like a cat on hot bricks. There are so many problems that I don’t know to deal with them.—Calm down first. Let’s see what I can do for you.。

仁爱版九年级英语上册 U4T3SB限时训练

九（上）Unit4 Topic3 Section B（限时训练）一、词汇A.根据句意及首字母提示补全单词。

1.Now the spaceships mainly use e________ controls. But they used to be controlled by astronauts.2.Thanks to the computer t____ ____, many problems can be solved easily.3.It’s very important for us to d______new ways of drying things.4.He r______that he must study hard from now on.5.Nothing is i_____ if you put your heart into it.B.根据句意，用括号内所给单词的适当形式填空。

1.The policeman advised him ______(take) a bus to go there.2.A long ladder is used ______(climb) up the building.3.Scientists make robots_____(serve) our life better.4.Bill made up his mind ____(catch) up with his classmates in study.5.Thanks for ______( invite) me.二、填入适当的关系代词，完成定语从句。

1.The book _____I bought yesterday cost me 28 yuan.2.That girl______has big eyes is my cousin Kate.3.Where these boys ______are playing soccer come from?4.These buildings ______were built last year are very beautiful.5.Zhai Zhigang is the first Chinese astronaut ______had a spacewalk.三、用that,which或who把下面的句子改成带有定语从句的复合句。

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Unit 4 topic3练习题一．选择题( ) 1 — Can you tell me the time? —_______.A. Yes, I can’tB. No, I canC. No, I can’t D Yes, I can.( ) 2 Is it time _______ to bed? A. go B. to go C. going( ) 3. I’m sorry. I have ______ watch. A. no B. not any C. not( ) 4. Mike often gets up ____ 6:40 ____ the morning.A. in; inB. on; onC. at; atD. at; in( ) 5. Maria often ____ breakfast at seven o’clock. A. drink B. has C. have D. eat ( ) 6. What’s wrong ____ you? A. about B. with C. of D. on ( ) 7. It’s very kind ____ him to cook food for his mother .A. for B. to C.of D with ( ) 8. It’s seven o’clock, it’s time to ____.A.goes homeB. go homeC. to go homeD. going home( ) 9. What time do you get up, Jim? —I get up ____.A about six o’clock B. at about six o’clock C. about at six o’clock D.six o’clock ( ) 10. It’s Sunday today. Why not _______?A. to go to the zooB. watch TV at homeC. flying a kite( )11. I don’t like the shirt. Please give me _____ one. A. any B. some C. another ( )12 There are ____ tigers in the zoo. Would you like to see them this afternoon?A. a fewB. anyC. fewD. a little( )13. May I ask you _______ questions? A. a B. any C. some( )14. There is a watch on the floor (地板). Please _______.A. pick up itB. pick it upC. pick one up D pick up them( )15. Does your sister get up __ six o’clock __ the morning?A. in, onB. at, inC. at, on( )16 I can’t _______ my ruler. A. find B. finds C. finding D.to find( )17 —Thank you very much. —_______.A. All rightB. Not at all.C. Thank you all the sameD. OK( )18 She can’t fin d her way _______. A. home B. to home C. at home( )19. —What’s the time? —It’s _______.A. thirty-five to tenB. eleven a quarterC. twenty past nine D nine o ten( )20 I’m afraid I may be _______ late.A. a fewB. a littleC. little D few( )21. All the teachers are friendly. We love __ very much. A. her B. they C. them D him ( )22 It’s very nice _______ you to help me. A. of B. for C. with D about ( )23_______ late. We must leave now. A. Don’t B. Don’t be C. Can’t be D No ( )24 I don’t like lions _______ elephants at all. A. or B. and C. so D with ( )25It’s time for ____home. Ago B going C to go D goes( )26 It’s time ____us____ go home.A of toB for forC for ofD for to( )27Let’s____, we don’t need to go to school.A to go to homeB to go homeC go to home Dgo home( )28My mother and I_____ at home .A doesn’tB don’tC aren’tD am not( )29____ you bring us some milk? OK. A Do B Could C Would D Why ( )30____wait a moment ,Ok? All right.A How aboutB WouldC L et’sD Let( ) 31.These books are _____. _____ are in _____ bags.A.my You youB.my Yours yourC. mine Your yoursD.mine Yours your( )32.Would you like _____ your mother cook supper?A. helpingB. to helpC. helpD. helping( )33.Let Tom _____ right away.A. go homeB. to go homeC. goes homeD. goes to home( )34.---May I have some milk? ---Sorry, we have _____ left（剩下）.A. fewB. a fewC. littleD. a little( )35.Tom with his classmates _____ an English lesson now.A. hasB. haveC. are havingD. is having( )36 .Could you_____ a message _____ him?A. take, toB. give, to .C. leave, fromD. give, for( )37.She is _____ the blackboard, but she can’t _____ the words on it.A. looking at, seeB. seeing, look atC. seeing, seeD. looking at, look at ( )38.We would like some meat and fruit _____ lunch. A. to B. in C. of D. for ( )39.Would you please _____ her _____ me back?A. ask, to callB. ask, callC. to ask, callD. to ask, to call( ) 40.Look at the boys. They _____ games at school.A. playB. playingC. are playD. are playing( ) 41 A: Here you are. B:A. That’s right.B. Let me see.C. Thanks.D. Yes, I like it( ) 42. A: B: He’s tall.A. Is the boy tall or short?B. Is the boy tall?C. Is the boy short?D. How old is he ?( ) 43. A: Would you like an egg and some fish? B: .A. No, please, I’m full.B. That’s a good idea.C. No, thanks. D You are OK ( ) 44 A: Thank you, Kangkang. B: .A. Not at all.B. Of course.C. I think so.D. Don’t say that( )45.－What’s your favorite______? Basketball A. sport B. color C. subject D. movie ( ) 46－May I help you?－.A. No, you can’t.B. Yes, please.C. Yes, you can.D. Sorry.( )47.___ _the man? He is Kate’s father.A. What’s.B. Who’sC.Whose’ sD. How’s( )48.－What color is it?－It’s orange. It’s orange pen.A. a, anB. an, anC. an, ×D. ×, an( )49－What you doing? I’ m a book.A. do, seeingB. are, lookingC. do, watchingD. are, reading( )50 It’s time ______ school.Ago to B to go C to go to D go ( )51He can’t find the way_____ home. A to B at C / D to at ( )52______, Let’s get off the bus.A here it isB Here we areC here you areD Here we are( )53Thank you for _____(tell) me the truth. A tell B telling C tells D to tell ( )54What time do you usually get up in the morning? At ________.A five to sixB half to sixC six halfD five past half( )55 There is __ _ milk. Could you help me do some shopping?A muchB manyC noD not( )56 Could you help me_____ the heavy bag.A carryB carriesC to carryingD carrying( )57 Jane with her parents often ____ for a picnicA goB goesC goingD to go( )58 Kate and her family _______some English songs in the afternoonA singB singsC to singD singing( )59 Thank you very much_____ you nice present. A to B for C on D of ( )60 Lucy often helps old people. ——It’s very kind____________.A heB of herC of hisD for you( )61We_____ here, let’s go to the zoo.A all areB all isC are allD is all( )62Come to my home tomorrow, I’ll____ you my photosA lookB watchC showD buy( )63Why not_______? Sorry, I don’t have his number.A call him backB to call back himC to call him backD to call back him ( )64___ he_____ to cook? Yes，he doesA Do, haveB does ,hasC does, haveD Does, have( )65Let’s _____ a kite in the park! Great!A going and flyingB go but flyC to go and flyD go and fly ( )66The students are on their way______.A to the schoolB to homeC homeD the school( )67It’s six o’clock. It’s time ____ supper.A haveB forC toD has( )68Mike often gets up____ 6:40 ___ the morning.A in, inB on, onC at, atD at, in( )69A quarter to nine is_____ A 9:15 B 9:45 C 8:45 D8:15 ( )70It’s very nice____ you___ meA for ,to helpB of, to helpC for, helpsD of, help( )71Mr.lee doesn’t like a tiger____ a lion A and B or C also D to 二用所给动词的适当形式填空1 Would you like ______ (go) to the zoo with us?2. Can I ______ (give) the food to the animals?3 My mother often ______ (take) me to the zoo on Sundays.4. What _______ (be) your favorite animals?5. Let’s _______ (drive) to the zoo this a fternoon.6We can see a lot of __ ___(animal) in the zoo. 7__ ____( Monkey) are my favorite animals.8 It’s time _____(do) some shopping.9 Thank you for_____(help) me.10It’s very kind of you _____(help) me.11 It’s time for us ______(go) home.12Don’t forget____(call) me back this evening. 13Sally wants to speak to______(she).14My mother often buys some vegetables on ____(she) way home.15she is very (friend) to me.16 Let’s _____(have) supper. 17It’s time ______(go) to school18 They often sing songs on _____(they) way home.19Thank you for______(teach) me so well. 20_______(lion) are my favorite animals 21 It’s time for us _______(go) home. 22 What about _______(eat) out with us?23 Please ask him_______(bring) his books here.24 Tom with her family _____(be) happy. 25 She ______(get) up at six every day.26My mother has supper at home(划线提问) _______ ______ your mother_______ supper? 27He can see Lion Show at 8 o’clock(提问) he at 8’o clock?三.句型转换1 He often goes to Yangyang’s home at eight o’clock. (对画线部分提问)What ____ _____ he often ____ to Yangyang’s home?2. What time is it?(同义句转换) _ ___ the time?3. It’s twelve forty-five.(同义句转换) It’s ____ __ __ __ __ one.4. Thank you. You help me.(合成一句) Thank you ____ your __ __.5. I, at 7: 30, go to school, in the morning (连词成句) ____ __________________________6. I like pandas best. (对划线部分提问)_______ _______ _______ you like best?7. I can see only one lion in the picture. (对划线部分提问)_______ _______ _______ can you see in the picture?8. His favorite animals are cats. (改为同义句) He _______ cats ______9. She has a new watch. (改为复数句) They _______ some new _______.10. It’s twelve o’clock now. （对划线部分提问）_______ the _______ now?11. It’s ten thirty.（改为同义句）It’s _______ _______ _______.12. It’s time for lunch. (改为同义句) It’s time _______ _______ lunch.13. Do you often get up at five forty?（改为同义句）Do you often get up at _______ _______ _______?14. It lives with us. (改为一般疑问句，并作否定回答)_______ it _______ with us? No, it _______.15. That is Tom’s home.（对划线部分提问）_______ home _______ that?16. The new zoo is over there.（对划线部分提问）_______ _______ the new zoo?17. We usually have supper at about six forty-five.We usually have supper at about _______ _______ _______ seven.18. You help us. You are very kind.（合并成一个句子）_______ kind _______ you _______ _______ us.19. Tom has supper at home.(提问) _____ ______ Tom _____ supper?20. What’s up? (同一句) _ __ _______ with you?21.Does she have time tomorrow? (同义句) ____ she____ tomorrow?22.He doesn’t have any cars.(同义句)23. Please tell her about it .(改为否定句)。