1. Everyone is busy _____ the examination in the classroom.
A. with B. for C. on D. under
解析： 注意几个固定搭配： be busy (in) doing sth 忙于做…; be busy with sth 忙于…; busy oneself (in) doing sth 忙于做……; busy oneself with sth 忙于……。
2. I suppose you couldn’t let me borrow your car this evening, _____?
A. couldn’t I B. don’t I
C. could you D. will you
解析：suppose 后面的从句中为否定式couldn’t，而主句为肯定式，这是否定后移的用法，后面的反意疑问句要根据从句而定，故反意疑问句用肯定式could you。
3. Smoking is not good _____ you because it can affect your health.
A. for B. at C. to D. on
解析： be good for… 对…有好处; be good at… 善长于…。
4. Henry and Bady _____ to the parties at the Trade union every Saturday.
A. are used to go B. use to go
C. used to go D. were used to go
解析： be used to do… 被用于做…; used to do… 过去常常…。
5. _____ , the inhabitants fled.
A. The city taken B. The city having been taken
C. Having taken the city D. The city being taken