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5. 每次我看到他的时候，他都面带微笑。（every time)

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答案

I. 1.enthusiastic 2.rejected 3.exposed 4.absorbed 5.announced 6.challenged 7.attended 8.conclusion 9.movement 10.cautious 11.positive 12.contribute

II. 1.提出 2. 得出结论 3. 使显露；暴露 4.将...和...联系

5.处...之外；此外 6.对...严格的 7.讲得通；有意义 8. cure... of

9. be absorbed in 10. contribute... to...

III. (A) 1.puzzled 2.bought 3.solving, made 4.lost 5.reserved 6.set 7.suspected 8.referred, (should) be e-mailed 9.seated 10.played, exciting 11.Being exposed 12.was, (should) be constructed

(B) 1.in 2.on 3.of 4.to 5.to 6.of 7.about 8.in/on/at 9.to 10.to

Ⅳ. 1. Only if you have passed the driving test can you be allowed to drive a car.

2. I had my wallet stolen yesterday.

3. Neither he nor I am going to attend the meeting.

4. I'll never forget the day on which I first met him.

5. Every time I see him, he wears a smile.