31．Computers __________ in our work, so we work much faster now.

A. use 　　　　　 B. used　　　　　 　 　 C. using　 　　 　　　 D. are used

30．-Do you know _______________________?

-Next Tuesday.

A. when Mr. White will visit us　 B. when will Mr. White visit us

C. why Mr. White will visit us　　 D. why will Mr. White visit us

29．－Aunt, Mary! Can Tom help me mend this car?

　 －Sorry, he __________to Shanghai. He won’t be back until next week.

A. goes　 　　 　　　 B. is going　 　　　　 C. went　 　　　　　　 D. has gone

28．- What will you do this weekend?

　 - We’ll have a picnic on the hill if it _________ fine.

A. is 　　　　　　 　　B. was　　　　 　 C. will be 　　　　D. has been

27．Teenagers should drink ________ milk, so they have strong bones.

A. little　　　　　 　　　 B. any　　 　　　 　　 C. some　 　　 　　 D. no

26．-You look tired today. What’s wrong with you?

-I _______ sleep well.

A. don’t　　　　 　　　 B. haven’t　 　　　　 C. won’t 　　　 　　　　　　　 D. didn’t

25．You’d better __________ at home. Your mother needs your help.

A. stay　　　　　 　 　　 B.　　 stayed 　 　　　 C. staying　　　　　　　 D. to stay

24．－How was your trip last Sunday?

－Great! But it was ____ than in the city because we were in the mountains.

A. cold　　 　 　　　　 B. colder 　 　　　　 C. coldest　 　　　　 D. the coldest

23．John doesn’t like playing sports __________ he likes walking his dog.

A. but　　　　　　　　　 B. and　　　　　　 　　　 C. so　　　　　　　 　　　 D. or

22．－Can I put the flower on the shelf?

　 －I’m afraid you __________. It may fall off and break.

A. mustn’t　　　 　　　 B. can’t　　　　　 　 C. needn’t　　　　 　　　 D. shouldn’t