31. We won’t give up _______ we fail ten times.

　 A. even if　　　　　　　 B. since　　　　　　 C. whether　　　 D. until

30. At this time tomorrow, we _______ an exam.

A. we are going to have 　　　　　　　　 B. we’ll be having

C. we’ll have　　　　　　　　　　　　　 D. we are to have

29. Some people fear that ______ air pollution may bring about changes in ______ weather around the world.

A. /; the　　　　　　　 B. the; /　　　　　 C. an; the 　　 D. the, a

28. -Why do you look sad?　 -There are so many problems _______.

　 A. remaining to settle　　　　　　　　　 B. remained settling

　 C. remaining to be settled 　　　　　　　 D. remained to be settled

27. -What did the hunter tell you?

-He said he was lucky to get out of the forest ______.

　 A. living　　　　　　　　 B. alive　　　　　　 C. lively　　　　　 D. live

26. You will find what great benefit the computer can be _____ each time you use it to help you work.

　 A. for　　　　　　　　　 B. of　　　　　 C. at　　　　　　　 D. on

25. -Is that the small town you often refer to？

-Right，just the one ______ you know I used to work for years.

A. that　　　　　　 B. which　　　　　　 C. where　　　　　　 D. what

24. She is not used to _______ like that.

　 　A. speak to 　　　　 B. spoke to　　 C. speaking to　　　 D. being spoken to

23. __________ the lights before you leave the office or you will be fined.

　 A. Turning off　　　　　 B. Turned off　　　 C. Turn off　　 D. To turn off

22. -Do you want a cup of tea or coffee?

-_________, I really don’t care.

A. Neither 　　　　 B. none　　　　 C. Either　　　　　 D. Both