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动词不定式可以充当________以外的所有成份；不定式作主语或宾语时，常用________形式主语或形式宾语；在see, hear, watch, feel, notice, observe, make, let, have, listen to, look at等词后的补足语中，不定式不带to，但是这些句子如果变成被动结构，就必须带________；动词不定式在介词________，________，________后面时，如果这些介词之前有行为动词do的各种形式，那么，这些介词后的不定式不带to，否则要带to。
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2. 学习有关语言的知识比使用语言容易。(动词-ing形式作主语)
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3. 我们应该尽力增强我们的体质。(build up)
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4. 好的习惯是成功的关键。(lead to)
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5. 我们把书放进书柜的目的是不沾上灰尘。(keep... free from)
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6. 我们会议的重点是妇女权利问题。(focus)
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7. 她设法降低她的体重。(reduce)
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8. 对人们说的话我不会作评论。(comment)
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9. 你是最后一个通过驾驶执照考试的人。(the last+动词不定式)
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10. 作无益的后悔是没有用的。(it作形式主语)
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阅读下面的短文，在标有序号的空白处填入一个适当的词，或填入括号中动词的适当形式。
It seems 1. that at my age I am still fit enough to cycle 20 kilometers in an afternoon. I think my long and active life must be 2. to the healthy life I live. I know how easy it is to start smoking and how 3. it is to stop. During adolescence, I also became 4. to cigarettes. When l was young, I didn't know that it could do 5. to my heart and lungs. 6. did I know that my cigarette smoke could affect the health of non-smokers. However, what I 7. (do) know was that my girlfriend thought I smelt terrible and that she wouldn't go out with me again unless I stopped. 1 also noticed that I became breathless quickly. Then I knew 8. was time to quit smoking. I'm sending you some advice to help you 9.your resolve. Every time you feel like 10.(smoke), remind yourself that you are a non-smoker. Keep trying, and you will succeed.
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阅读下面的短文，在标有序号的空白处填入一个适当的词，或填入括号中动词的适当形式。
I know how easy it is to start smoking and how difficult it is to stop. During adolescence, I became 79 to cigarettes. When l was young, I didn't know that it could do 80 to my heart and lungs. Neither did I know that my cigarette smoke could affect the 81 of non-smokers. However, what I did know was that my girlfriend thought I smelt terrible and that she wouldn't go out with me again 82 I stopped. 1 also noticed that I became breathless quickly. Then I knew 83 was time to quit smoking. I'm sending you some advice to help you 84 your resolve. Every time you feel like 85 (smoke), remind yourself that you are a non-smoker. I know it is not easy to get rid of the 86 , but millions have managed 87 (quit) and so can you. Keep trying, and you will 88 eventually.