31. The teacher asked the students when the universe _____ into being.

A. come 　 　　B. comes　　　 C. came　　　 D. has come

29. Scientists say they are beginning to ______ in the fight against cancer.

A. break down　 B. break through　 C. break into　　　 D. break off

30 In today’s world, the Internet is a very useful tool for _____ business communication.

A. wrapping up　 B. growing up C. speeding up　 D. pulling up

28. It was with great joy ____ he received the news ____ his lost daughter had been found.

A. because, that　 B. since, which　　 C. for, about　　 D. that, that

27. In order to protect the environment, we should always ______ after a picnic.

A. clean up　　 　　 B. turn up　　 C. set up　　　 D. take up

26. There _______ more than 30 students in our class, the majority of which _______ boys.

A. are; are　　 　　　B. is; is　 　　　C. is; are　　 　　D. are; is

25. Most of the evidence was destroyed in the fire. _______, it would be almost impossible to prove him guilty.

A. Instead　　 　　　B. Thus　 　　 　　C. 　Besides　 　　D. However

24. Whenever possible, Thomas likes to _______ how well he speaks Chinese.　

A. show off　　 　B. show around　 　　C. show up　　 D. show out

23. It’s already 11 o’clock. It’s high time you _______ watching TV.

A. stopped　 　　　　 B. stop　　　 C. will stop　　　 D. should stop

22. -What did the doctor tell him to do?

-She insisted that he _______ smoking.

A. could give up　 B. gave up　 　C. give up　 D. would give up

21. -I’ll go to Canada for a holiday.

-If I were you, I _______ to France.

A. went　　 　　　B. will go　　 　　 C. go　 　 　D. would go