16.　　 It was playing computer games that cost the boy a lot of time that he __________ doing his lessons.

A. might have spent　　　　　　　　　　　　　　 B. ought to have spent

C. must have spent　　　　　　　　　　　　　　 D. could have spent

15.　　 Professor Smith, many students want to see you. __________ they wait here or outside?

A. Do 　　　B. Shall 　　　C. Will 　　　D. Would

14.　　 　Better go to see my sick colleague right now, ________I?

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

13.　　 I promised to get there before 5 o’clock, but now the rain is pouring down. They ______ for me impatiently.

A. may wait 　　　B. ought to wait 　　　C. could wait 　　　D. must be waiting

12.　　 She’s already an hour late, What _____to her?

A can have happened 　　　B may happen

C should have happened 　　　D may have happened

11.　　 As it tuned out to be a small house party, we ____ so formally.

A. needn’t dress up 　　　B. couldn’t have dressed up

C. didn’t need dress up 　　　D. needn’t have dressed up

10.　　 — The woman biologist stayed in Africa studying wild animals for 13 years before she returned.

— Oh, dear! She ______ a lot of difficulties!

A. may go through　　　　　　　　　 B. might go through

C. ought to have gone through　　　　 D. must have gone through

9.　　　　 John, look at the time. ______ you play the piano at such a late hour ?

A. Must　　　 B. Can　　　　 C. May　　　 D. Need

8.　　　　 It is hard for me to imagine what I would be doing today if I _______ in love at the age of seven, with the Melinda Cox Library in my hometown.

A. wouldn’t have fallen　　　 B. had not fallen　　　 C. should fall　　　 D. were to fall

7.　　　　 — Are you still going to Shanghai for the Spring Festival?

— Yes, but I really _____ because I have a lot of things to deal with.

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