31. A. sleep 　　　　　　　 B. asleep　　　　　　 C. sleeping　　 　 D. go to bed

29.While I was chatting with one of my friends on the Internet, ______ occurred to me ______ I needed to download some information about my research.

　 A. what; that　　　 　B. what; which　

C. it; which 　　　　D.it; that

28. I love to climb to the top of the mountain and stay there for some time. It ______ good to breathe in the clean and fresh air there.

　 A. does　 　B. feels　　 C. gets　　 D. makes

27. It was owing to luck ______ judgement ______ the driver succeeded in avoiding an accident.

　 A. better than; when　　 B. rather than; that　　

C. other than; when　　 D. more than; which

26. Colds are very ______ in that area every spring and early summer.

　 A. ordinary　　 B. common　　 C. popular　　 D. general

25. The bank was robbed last night and the police ______ the case now.

　 A. are searching for　 B. is looking into　

C. are looking into　 　D. is searching for

24. The old man is very popular among the children because he is good at ______ jokes.

　 A.making up　　 B.opening up　 C. setting up　　 D. turning up

23. ---- David, you did a good job in this discussion.

---- I surfed the Internet for some background knowledge, so I was ______ able to say more about the topic.

　 A. commonly　 　　　B. comparatively　　

C. effectively　　 　　D. separately

22. ---- Why didn’t you tell him about the result of the test?

　 ---- He rushed out of the room ______ I could say a word.

　 A. before　　 B. until　　 C. when　　 D. after