北师大版高中英语必修五Unit 13《People》基础练习及答案

再接再厉
（课后巩固类训练）
●Elementary exercises（基础题)
Ⅰ、 Multiple choice(单项选择）
1、 In such a formal party， you need to dress __________、
A、 accurately
B、 appropriately
C、 associatively
D、 entirely
答案:B “穿得得体、适宜"。

2、 Scientists have shown that there is a __________ between cigarette smoking and certain diseases、
A、 connection
B、 description
C、 expression
D、 devotion
答案:A
3、 A forced kindness __________ no thanks、
A、 needs
B、 associates
C、 prays
D、 deserves
答案：D deserve+n、 /pron、 /to do。

“被迫作出的善举不值得感激.”
4、 The ancients were __________ in their belief that the earth was flat、
A、 independent
B、 mistaken
C、 gifted
D、 selfish
答案：B sb、 be mistaken about sth、某人弄错了某事；mistaken还可以作定语,“错误的”,如a mistaken idea.
5、 He studied hard and __________ he got high marks、
A、 so
B、 that
C、 thus
D、 yet
答案：C so是连词，不能和and一起用。

thus是副词，表示“因此;就这样”。

6、 The need to communicate is a key __________ of human society、
A、 characteristic
B、 emergency
C、 possibility
D、 personality
答案：A “交流的需要是人类社会的重要特征.”personality是“个性”.
7、 B ill has the __________ of knowing that his efforts saved the boy’s life、
A、 satisfy
B、 satisfied
C、 satisfaction
D、 satisfactory
答案:C A项是动词，B和D项是形容词。

8、I don’t think it easy to fulfill the requirement that I __________ the task in a month, even if I did manage to do that、
A、 finished
B、 finish
C、 would finish
D、 shall finish
答案:B require和requirement引起的从句中谓语动词都用虚拟语气结构：sb、(should)do sth、。

9、 To __________ his theory， he did numerous experiment， but every effort seemed in vain、
A、 predict
B、 accuse
C、 judge
D、 confirm
答案：D
10、 They were dressed __________ in blue T—shirts and white pants、
A、 like
B、 forever
C、 alike
D、 independently
答案：C 这里alike是副词“相像地”，alike还可以作表语形容词“像的"，如：Mother and I are exactly alike、
Ⅱ、 Complete the sentences according to the Chinese meanings、
（根据汉语意思完成句子。

）
1、 I will never __________ __________ __________ __________（原谅你的那个谎言）， which hurt me so much、
2、 The king __________ me __________ my __________ __________（准许了我对这块地的所有权)the land、
3、 He told the false one from the rest __________ __________ __________（仅一眼）、
4、 Can you tell me __________ __________ __________(用什么程序）is cloth made from wool？
5、 He almost __________ __________ __________ __________(伤了他的腿)when __________ __________(试图救出）a mate from a fall of the wall、
6、 __________ __________ __________ __________（记录下来)how much money you spend on the trip、
7、 __________ __________ __________（能到何种程度）are you going to help me？
8、I’m surprised at __________ __________ they made __________(对……的利用)the deserted bucket、
9、 __________ __________ __________(不论发生什么)you， you should stick on, or else you are to __________ __________ __________(以失败告终）、
10、 It __________ __________ __________（讲不通)that Lily __________ __________ __________（依恋）Sara—they were enemies before!
答案：1、 forgive you that lie forgive是及物动词，可以分别接要原谅的人或行为，也可以接双宾语,即forgive sb、 sth、 .
2、 confirmed； in； possession of confirm sb、 in sth、在某方面批准、准许某人。

3、 at a glance
4、 by what process 以……程序用by、、、 process。

5、 had his legs injured； trying saving 这里有四个空格，又没有说出伤腿的具体事物，说明应用have sth、 done的结构。

意外伤害多用injure；when引导的时间状语从句的主语就是主句的主语he，则这里可以省略主语。

try与he之间是主谓关系,因此要用trying.
6、 Make a note of make a note of/make notes of sth、“作记录”。

7、 To what extent to、、、extent“到……程度".
8、 the use; of make use of sth、“利用某物”.这里有一个定语从句，先行词use在定语从句中作made的宾语，而the deserted bucket是of的宾语,不能忘记of.
9、 Whatever happens to； end up failing whatever可以引导主语、宾语、表语、同位语等名词性从句,也可以引导状语从句。

10、 makes no sense； is attached to
Ⅲ、 Change the sentences with past participles、(用过去分词转换句子。

）
1、 Where are the seats which have been reserved？
______________________________________________________________________
2、 The funds which have been raised are mainly used for helping the homeless、
______________________________________________________________________
3、 This book， which is written in simple English， is suitable for beginners、
______________________________________________________________________
4、 The building which is newly built is our office building、
______________________________________________________________________
5、 The film describes the story about the police who pursue a man that escaped、
______________________________________________________________________
6、 Because she was confined to bed, she needed to be waited on in everything、
______________________________________________________________________
7、 Though he was defeated， he remained a popular boxer、
______________________________________________________________________
8、 If more attention was given, the trees could have grown better、
______________________________________________________________________
答案:1、 Where are the reserved seats？
2、 The funds raised are mainly used for helping the homeless、
3、 This book, written in simple English, is suitable for beginners、
4、 The newly—built building is our office building、
5、 The film describes the story about the police who pursue an escaped man、
6、 Confined to bed， she needed to be waited on in everything、
7、 Defeated, he remained a popular boxer、
8、 Given more attention, the trees could have grown better、
Ⅳ、 Translate the following sentences into English with the help of the hints in the brackets、(用括号中的提示将下列句子译成英语。

)
1、我们昨天是在剧院门口偶然碰到的。

(It is、、、 that、、、）
______________________________________________________________________
2、不吸烟的人比常吸烟的人更机敏这一现象值得研究。

（It is worth studying that、、、）
______________________________________________________________________
3、你肯定上课时睡着了,不然你不会答错这么简单的题。

(must have、、、； could
not have )
______________________________________________________________________
4、这种食物在冰箱里放得越久,它含有的热量就越少，而热量是以calorie(卡路里)来计量的.（the more、、、 , the more、、、 ;as measured by）
______________________________________________________________________
5、如果作业中有拼写错误,请把它们改正。

（if any）
______________________________________________________________________
6、去看戏要穿得整齐,还要化妆,这是西方人的一个习俗。

（It is a custom that)
______________________________________________________________________
答案:1、 It was at the theater gate that we came across each other yesterday、本题是强调句型。

强调地点状语“在剧院门口”。

2、 It is worth studying that non—smoking people are more quick-witted than those regularly smoke、
3、 You must have fallen asleep in class，or else you couldn’t have given a wrong answer to such an easy question、此句中的两个分句均是对过去发生的事情的推测。

前一句是肯定推测,用must have done，表示过去一定发生了某事;后一句是否定推测，用can’t或couldn't have done，表示过去不可能发生某事。

4、 The longer the food is kept in the fridge, the less its heat quality， as measured by calories, will become、
5、 Please correct the spelling mistakes in your homework， if any、
6、 It is a custom in the western country that one needs to put on make—up and wear neatly for going to the theater、
●Integrated exercises(综合题）
Ⅴ、 According to the hints in each group， describe the pictures and tell the things different and in common between them and write something down、（根据每组图片的提示,找出各组图片中的相同和不同之处并将它们写成小段文字。

）
1、 having a hat or not; moustache and beard they are wearing； glasses on face or not； clothes; expressions on their faces
Key words: old man， white beard/moustache， cow-boy hat， traditional clothes；smile， calm, serene
something in common ____________________
something different ____________________
2、 hair; expressions on their faces; the moods they seem in
Key words: long, short, shoulder-length， straight， curl, make-up, frown, worried， frustrated， excited， big smile
something in common____________________
something different____________________
what they may be doing
Lady A: ____________________
Lady B: ____________________
Lady C： ____________________
3、 age; relationships between them； their feelings
Key words: elderly, wrinkles， couples, happy， love， optimism， gentle， be attached to, smile, laugh
something in common____________________
something different____________________
答案：这是一道自由发挥的题目.对于图片,每个人都会有自己的体会和感想。

即使是同一个人，在不同的时间和情绪下，看法也会不同。

因此,没有固定的划一的说法。

请尽量用本单元学到的单词写出描述性的句子,并尽可能地表达你自己对图中人物行为和情绪的想象.写完后，请与同学交流、讨论。

Ⅵ、 There is some information on my mother， and please make up a complete passage about what my mother was like、
(请根据给出的“我的母亲”的有关信息，写一篇完整的描述母亲的短文.)
Occupation: an experienced teacher of a kindergarten
Appearance: looks younger， middle height, middle weight, long black hair， a pigtail， big and beautiful eyes
Characteristics： easy-going, tolerate, forgive， patiently
Hobby： clean the house, raise flowers， knit
Weakness: cooking is not so good
My Mother
___________________________________________________________________________ ______________________________________________________________________________答案：
My Mother
My mother is an experienced teacher of a kindergarten、 Being with lovely children every day， she looks younger than she really is、 With middle height and middle weight, she has long black hair which she usually combs into a pigtail、 On
her face， where there is a pair of big and beautiful eyes that can speak， you can easily find love and care、
My mother is easy—going and is ready to tolerate and forgive others' mistakes、Her pupils-the little kids are trouble-making、 However, she rarely scolds or punishes them、 Instead， she tells them what to do in the future and explains the reasons to them patiently、
At home， my mother likes cleaning the house， raising flowers and plants very much、 She also loves knitting and often knits us pretty woolen sweaters、 But unfortunately， her cooking is really not so good、
●Origin al exercises（探究创新题)
Ⅶ、 Read the text and answer the following questions、 (阅读表达。

)
Rome had the Forum; London has Speaker’s Corner、 Now always-on-the—go New Yorkers have Liz and Bill、
Liz and Bill， two college graduates in their early 20s, have spent a whole year trying to have thousands of people talk to them in subway stations and on busy street corners、 Just talk、
Using a 2-foot-tall sign that says, “Talk to Me”, they attract conversationalists, who one evening included a mental patient, and men in business suits、
They don’t collect money、They don’t push religion、So what’s the point?
“To see what happens，”said Liz、“We simply enjoy life with open communication、”
Shortly after the September 11， 2001 attacks， they decided to walk from New York City to Washington, a 270-mile trip、 They found they loved talking to people along the way and wanted to continue talking with strangers after their return、
“It started as a crazy idea, ” Liz said、“We were so curious about all the strangers walking by with their life stories、 People __________:their jobs, their clothes， their childhood experiences， anything、”
Denise wanted to talk about an exam she was about to take、 She had stopped by for the second time in two days， to let the two listeners know how it went、Marcia had lost her husband to a serious disease、“That was very heavy on my mind，” Marcia said、“To be able to talk about it to total strangers was very good, "she explained、
To celebrate a year of talking， the two held a get—together in a city park for all the people they had met over the past year、 A few hundred people showed up, as well as some television cameramen and reporters、
They may plan more parties or try to attract more people to join their informal talks、 Some publishers have expressed interest in a book， something they say they'll consider、
1、 What is the best title for the passage?（within 10 words)
______________________________________________________________________
2、 Please fill in the blank in the last but four paragraph with proper words or phrases to complete the sentence？（within 10 words)
______________________________________________________________________
3、 Which sentence in the passage can be replaced by the following one?
What on earth do they talk for?
______________________________________________________________________
4、 Will you talk about your private affairs to a stranger？Why or why not？（within 30 words）
______________________________________________________________________
5、 Translate the underlined sentence in the last but three paragraph、
______________________________________________________________________
答案:1、 Talk to me
2、 will talk to us about anything
3、So what’s the point?
4、 Omitted、
5、两天之后她经过时又被拦住一次,得以让那两个倾听者知道了事情的进展。

●Link to test（链接）
Ⅷ、 Multiple choice（单项选择)
1、（全国Ⅱ，9)It was not until she got home __________ Jennifer realized she had lost her keys、
A、 when
B、 that
C、 where
D、 before
答案:B 这是强调句型,强调的是时间状语not until she got home。

2、（天津,11）We __________ have proved great adventurers, but we have done the greatest march ever made in the past ten years、
A、needn’t
B、 may not
C、shouldn’t
D、mustn’t
答案:B 此句意为：我们也许不是了不起的冒险家,但是我们进行了过去10中最了不起的征程。

may not指不太肯定的推断，needn’t have done表示“本来不需要而做了”，shouldn’t have done意为“本来不应该做但是做了”。

3、（重庆,33)Nobody believed his reason for being absent from the class __________ he had to meet his uncle at the airport、
A、 why
B、 that
C、 where
D、 because
答案:B that he had to meet his uncle at the airport作reason的同位语。

4、（浙江，4）__________ is our belief that improvements in health care will lead to a stronger, more prosperous economy、
A、 As
B、 That
C、 This
D、 It
答案:D it作形式主语,真正的主语是that improvements in health care will lead to a stronger， more prosperous economy。

只有it能作形式主语。

5、 ( 浙江，5）When __________ different cultures, we often pay attention only to the differences without noticing the many similarities、
A、 compared
B、 being compared
C、 comparing
D、 having compared
答案:C 主句主语是we,与compare是主谓关系,因此compare用-ing形式引导时间状语从句。

6、 (湖北黄冈月考, 23)English is a language that many young people around the
world __________ not speak perfectly but at least __________ understand、
A、 may; can
B、 would； might
C、 will； must
D、 could; might
答案:A 第一个空格中的情态动词表示不肯定的推测,第二个空中的情态动词表示有做某事的能力。

7、（福建， 33)__________ for the breakdown of the school computer network, Alice was in low spirit、
A、 Blaming
B、 Blamed
C、 To blame
D、 To be blame
答案：B 主句主语Alice和blame之间是动宾关系，即Alice是blame这个动作的承受者,因此blame要用-ed形式引导原因状语从句。

8、（辽宁， 35)It was after he got what he had desired __________ he realized it was not so important、
A、 that
B、 when
C、 since
D、 as
答案:A 强调句型，强调的是时间状语after he got what he had desired。

9、 ( 安徽, 29)A warm thought suddenly came to me __________ I might use the pocket money to buy some flowers for my mother's birthday、
A、 if
B、 when
C、 that
D、 which
答案:C that引导thought的同位语从句。

从句中没有任何疑问，只是陈述想法的内容，因此用that引导.
10、 ( 山东，24)I’d appreciate __________ if you would like to teach me how to use the computer、
A、 that
B、 it
C、 this
D、 you
答案：B it在这里作形式宾语，if引导真正的宾语从句。

这里表现的也是appreciate 的常用句型之一 sb、 appreciate it that、、、。

11、（山东， 32)I just wonder __________ that makes him so excited、
A、 why it was
B、 what he does
C、 how it is
D、 what it is
答案：D wonder的宾语从句是强调句型的疑问句。

可以看出，若去掉it is that，剩下的部分what makes him so excited是完整的宾语从句,因此确定这是一个强调句型,强调的是主语（what）.
12、（广东， 29）No matter how frequently __________， the works of Beethoven still attract people all over the world、
A、 performed
B、 performing
C、 to be performed
D、 being performed
答案：A 显然，perform的逻辑主语就是主句主语the works of Beethoven,它们之间是动宾关系，因此用—ed形式引导从句。

13、 ( 湖南， 26)As the busiest woman in Norton, she made __________ her duty to look after all the other people's affairs in that town、
A、 this
B、 that
C、 one
D、 it
答案：D it作形式宾语，真正的宾语是to不定式引导的从句。

14、 ( 四川， 30)—It’s thirty years since we last met、
—But I still remember the story, believe it or not, __________ we got lost on a rainy night、
A、 which
B、 that
C、 what
D、 when
答案:B that引导story的同位语。

believe it or not是插入语，不影响句子结构。

15、 ( 四川, 32）-Is Jack on duty today？
—It __________ be him、It’s his turn tomorrow、
A、mustn’t
B、won’t
C、can’t
D、 needn't
答案:C 表示“不可能”.
16、（广东,33)-I’ve taken someone else’s green sweater by mistake、
—It __________ Harry’s、 He always wears green、
A、 has to be
B、 will be
C、mustn’t be
D、 could be
答案：D 表示推测，又不是特别肯定，因此要用could,也可以用may,might等.C项不能表示推测。

17、（上海,33)__________ into use in April 2000， the hotline was meant for residents reporting water and heating supply break downs、
A、 Put
B、 Putting
C、 Having put
D、 Being put
答案:A hotline和put之间是动宾关系,因此用put的过去分词形式引导时间状语从句.这里表述的是过去的事实，因此不用完成时态，即使用,也应是having been put。

18、（湖南师大附中模拟,33)Well, Tom， I have nothing secret to tell you、__________ you want me to say？
A、 How is it that
B、 How it is that
C、 What is it that
D、 What it is that
答案:C 强调句型的疑问形式。

被强调的是say的宾语，即疑问句的引导词 what。

19、 ( 全国Ⅰ, 35）The chairman thought__________ necessary to invite Professor Smith to speak at the meeting、
A、 that
B、 it
C、 this
D、 him
答案:B it是形式宾语，真正的宾语是to引导的从句。

20、（重庆一中模拟,30)__________ is known to all is __________ many young students are sports and movie fans、
A、 As； that
B、 What; what
C、 It; that
D、 What； that
答案:D __________is known to all是主语从句，引导词要作从句的主语且代指事物,用what; 第二个空中需要的是表语从句的引导词,且在从句中不作成分,因此用that。

Ⅸ、 Cloze(完形填空）
（全国Ⅰ）One afternoon I was sitting at my favorite table in a restaurant, waiting for the food I had ordered to arrive、 Suddenly I 1 that a man sitting at a table near the window kept glancing in my direction, 2 he knew me、 The man had a newspaper 3 in front of him， which he was 4 to read， but I could 5 that he was keeping an eye on me、 When the waiter brought my 6 the man was clearly puzzled(困惑） by the 7 way in which the waiter and I 8 each other、 He seemed even more puzzled as 9 went on and it became 10 that all the waiters in the restaurant knew me、 Finally he got up and went into the 11 、 When he came out， he paid his bill and 12 without another glance in my direction、
I called the owner of the restaurant and asked what the man had 13 、“Well, ” he said, “that man was a detective、 He 14 you here because he thought you were the man he 15 、”“What?” I said, showing my16 、 The owner continued，“He came into the kitchen and showed me a photo of the wanted man、I 17 say he looked very much like you！ Of course， since we know you， we told him that he had made a 18 、” “Well, it’s really19 I came to a restaurant where I’m known、” I said、“ 20 , I might have been in trouble、”
1、 A、 knew B、 understood C、 noticed D、 recognized
2、 A、 since B、 even if C、 though D、 as if
3、 A、 flat B、 open C、 cut D、 fixed
4、 A、 hoping B、 thinking C、 pretending D、 continuing
5、 A、 see B、 find C、 guess D、 learn
6、 A、 menu B、 bill C、 paper D、 food
7、 A、 direct B、 familiar C、 strange D、 funny
8、 A、 chatted with B、 looked at C、 laughed at D、talked about
9、 A、 the waiter B、 time C、 I D、 the dinner
10、 A、 true B、 hopeful C、 clear D、 possible
11、 A、 restaurant B、 washroom C、 office D、 kitchen
12、 A、 left B、 acted C、 sat down D、calmed down
13、 A、 wanted B、 tried C、 ordered D、 wished
14、 A、 met B、 caught C、 followed D、 discovered
15、 A、 was to beat
B、 was dealing with
C、 was to meet
D、 was looking for
16、 A、 care B、 surprise C、 worry D、 regret
17、 A、 must B、 can C、 need D、 may
18、 A、 discovery B、 mistake C、 decision D、 fortune
19、 A、 a pity B、 natural C、 a chance D、 lucky
20、 A、 Thus B、 However C、 Otherwise D、 Therefore
答案：1、 C 作者正在等着上饭的时候，突然注意到（noticed)坐在靠近窗口的一个人不停地朝他这边扫视，引起了他的警觉。

know意为“知道，了解,认识，认出”；understand 意为“懂,了解；听说；以为”；notice意为“注意到;看到；留心";recognize意为“认出;认可，承认"。

根据句中关键词“Suddenly”可知只有noticed符合语境。

2、 D 那个人不停地朝作者这边扫视,好像(as if)他认识作者。

since意为“自……以后/以来;因为;既然”;even if意为“即使”;though意为“虽然，尽管”;as if意为“好像，似乎”。

句中的“kept glancing in my direction”是关键信息.
3、 B 那个人在面前展开(open)一张报纸,装作在看报。

flat意为“(使）变平”；open 意为“展开，开始, 展现”；cut意为“切,割，剪”；fixed意为“固定，注视等”。

根据下文“which he was 4 to read”可知报纸是展开的。

4、 C 那个人虽然展开了报纸,但是假装(pretending)在看报。

他是在拿报纸作掩护，实际上是在窥视作者.hope意为“希望，盼望，期待"；think意为“认为,以为，预料”；pretend意为“假装，装扮”；continue意为“继续，连续”.从下文“but I could 5 that he was keeping an eye on me、”可知那个人并非真的在看报。

5、 A 作者可以看出（see）那个人一直在窥视他。

see意为“发觉,注意，看见”；find意为“发现，找到，感到”;guess意为“猜测，推测,认为”；learn意为“获悉,了解，认识到”。

该题根据上文意境容易作出判断。

6、 D 当服务员为我端来食物(food）时，那个人感到困惑.menu意为“菜单”;bill 意为“账单,清单"；paper意为“纸,报纸,文件"；food意为“食物”。

从第一段第一句中的“waiting for the food I had ordered to arrive”可知答案。

7、 B 那个人对我和服务员之间闲谈（chatted with)的那种常见的或听惯的（familiar)方式感到困惑.direct意为“直接的,直率的”;familiar意为“常见的，听惯的，熟悉的”;strange意为“陌生的，奇怪的";funny意为“有趣的,好笑的，滑稽的,古怪的”.服务员和顾客之间简短的闲谈在服务场合是司空见惯的，由此常识可作出判断。

8、 A chat with意为“与……聊天,与……闲谈"；look at意为“看着,考虑”;laugh at意为“嘲笑，漠视”；talk about意为“谈论，讨论，议论”。

因为作者常去那家饭店，对那里的人和环境都比较熟悉,和服务员之间的闲聊是常有的事。

9、 B 时间（time）一分分地过去，那个人好像感到更加困惑。

as time went on表示“时间渐渐地过去”.那个人对作者和服务员之间的那种闲聊的方式越来越感到怀疑。

10、 C 很明显（clear）,那个饭店的服务员都认识作者。

true意为“真实的,真正的,正确的”；hopeful意为“有希望的";clear意为“明显的,清楚的，清晰的";possible意为“可能的”。

从第一段首句中的“、、、 I was waiting at my favorite table in a restaurant”可知作者是这家饭店的常客，因此,这里所有的服务员都认识他是显而易见的.
11、D最后那个人站起来走进厨房（kitchen）。

从下文“He came into the kitchen、、、”可知答案。

12、 A 那个人从厨房里出来付了账单后，没有再朝作者那边看一眼就离开（left）了饭店。

leave意为“离开,动身，剩下”;act意为“行动，扮演”；sit down意为“坐下”;calm down意为“平静下来,镇定下来”。

从下文可知侦探弄清作者不是他要找的人时,就离开了饭店。

13、 A 我向饭店主人询问那个人想要（wanted）什么.want意为“想要,希望，需要”；try意为“试图,试，试验”;order意为“命令，吩咐”；wish意为“希望,想要".表示“想要……"时，want后可以直接跟宾语,wish后须加介词for后才能跟宾语。

14、 C 侦探原以为作者就是他在寻找（was looking for）的人,于是就跟随（follow）他来到这家饭店。

meet意为“遇见，相遇,和……会面”;catch意为“捕获,赶上”；follow 意为“跟随，注视,追随,注视”；discover意为“发现，发觉”.侦探发现可疑的人后，往往对其跟踪或盯梢。

15、 D be to beat意为“打算打(败)”;be dealing with意为“在处理,在对付”；be to meet意为“打算会见/迎接”;be looking for意为“在寻找，在期待"。

16、 B 作者得知自己被误认为是嫌疑人而被盯梢时，表现出惊愕（surprise).care 意为“注意,照料,忧虑";surprise意为“惊奇，惊愕,诧异”;worry意为“烦恼,忧虑,苦恼”;regret意为“遗憾，悔恨,抱歉”。

句中的“What？”为关键信息词。

17、 A 饭店主人坚持(must）说侦探要找的人和作者看起来很像。

must意为“坚持要，一定要”;can意为“可能，能够";need意为“必须,必要”;may意为“可能，也许”。

侦探在饭店主人有充足的理由证明作者不是他要找的人时，才肯罢休。

18、 B 饭店的人告诉侦探他搞错(mistake)了。

make a discovery意为“发现”;make
a mistake意为“做错，犯错（误）";make a decision意为“作出决定”；make a fortune 意为“发财，赚（大）钱"。

侦探误以为作者是嫌疑人而对其进行跟踪，结果被饭店人员证明侦探搞错了.
19、 D 作者到店员认识他的饭店用餐感到很幸运（lucky）。

pity意为“憾事，怜悯"；natural意为“自然的”；chance意为“机会，运气";lucky意为“幸运的，侥幸的”。

20、 C 幸亏饭店的人和作者很熟,不然的话(otherwise)，作者也许就陷入了麻烦.thus 意为“因而，如此,从而,就这样”;however意为“可是，仍然”；otherwise意为“否则，不然的话”;therefore意为“因此，所以"。

Ⅹ、 Correction(改错)
（全国Ⅱ)
An American and a Frenchman decided to cross the sea
between France and England in the balloon in 1784、1、__________
High over the water, they discover a hole in the balloon、 The 2、__________
hole became bigger and bigger、 The air keeps the 3、__________
balloon up was escaping quickly and the balloon was 4、__________
coming up、 The two men threw all their equipment into 5、__________
the water to make the balloon light、 It started to rise 6、__________
higher again、 So it was still too close to the water、7、__________
Finally， the men threw away most of his clothes to 8、__________
save themselves、 The crowd waiting for to greet them in 9、__________
England was very surprised see this when the balloon 10、__________
landed in front of them、
答案：1、the→a 首次提到气球。

2、discover→discovered由上句“in 1784”知应用一般过去时.
3、keeps→keeping这句话的谓语是was escaping,keep应该是非谓语动词，与air 之间是主谓关系,因此应该用—ing形式。

4、√
5、up→down从上文容易知道因为漏气气球在下降。

6、light→lighter 扔掉装备是气球变得轻一些.
7、So→But虽然升起来一些，但仍然离水面太近，所以才有下文的脱衣服.
8、his→their主语是the men，两个人。

9、去掉for wait to do sth、“等着做某事”.
10、 see前加to be surprised to do sth、“惊讶地……”。