必修四第一单元单词第一部分练习

[仿写] 1. 一旦你开始读, 你就会喜欢它。 Once you begin to read it, you will like it. 2. 一旦你开始了，就不要放弃。 Once you start, never give it up. 3. 一旦染上坏习惯，想改掉就难了。 Once you get into a bad habit, it is hard to get out of it.
Once water begins to boil, its temperature no longer rises. 水一开始沸腾，温度就不再升高。 Once it is seen, it can never be forgotten. 见一次就永远不会忘记。 Physics is easy to learn once you understand the rules. 一旦你理解了规则，物理就不难学了。
翻译下列句子。 1. 人们涌入那个新超市去购物。 People crowded into the new supermarket to go shopping. 2. 往事涌上她的心头。 Memories crowded into her mind / crowded in on mily of chimps wake up is our …. 观察黑猩猩一家如何醒来是我们......
用所给单词的适当形式填空。 1. He finds it hard to train children to ______ behave (behave) well at the table. 2. It didn’t seem worthwhile __________ (worthwhile) writing it all out again. 3. The police have been observing _________ (observe) his movements these days.
主语是由不定式、动名词、从句构成 的，谓语动词采用单数。 e.g. Working with you is pleasant. Seeing is believing.
1. 只有当你明白我的意思了, 你才能认识到你 的错误。
Only when you understand what I mean, can you realize your mistake. 2. 只有当战争结束之后, 他才重新回来工作。 Only after the war was over did he come back to work. 3. 只有用这种方法, 我们才能按时完成任务。 Only in this way can we finish the task in time.
4. As a teacher, he is ________ respected (respect) for his good teaching. 5. What are you two _______ arguing (argue) about? 6. This school is _________ supported (support) by the government. 7. We remembered the ________ inspiring (inspire) talks he gave us last time.
4. Once I stop, it all comes crowding in and I remember the chimps in laboratories. 我一旦停下来，所有的一切都会涌上心头， 我就会想起实验室里的黑猩猩。 [点拨] 此句是一个主从复合句结构。主句是 由and连接的两个并列分句；从句是once引 导的时间状语从句，即：Once I stop。在主 句中crowding in是动词-ing短语作状语修饰 comes。once用作连词时，意为“一旦…… 就……”，用于连接时间状语从句。如：