20. -- Excuse me, what time is it now?

　　 -- Sorry, my watch ____. It ____ at the shop.

　　 A. isn't working; is being repaired　　 　　　　　　　 B. didn’t work; is being repaired

　　 C. wasn't working; is repaired　　　　　　　　　　　　　　 　　 D. doesn't work; is repaired

19. We've missed the last bus, I'm afraid we have no ____ but _____ a taxi.

　　 A. choice; to take　 　B. way; took　 　　C. possibility; taking　　 D. selection; take

18. -- I'm afraid I can't finish the book within this week.

-- ____.

　　 A. Take your time　 B. Please go ahead　　　 　　 C. Not at all　　 D. That's all right

17. The result of the experiment was very good, ____ we hadn't expected.

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

16. The project will take Tom and Jerry several months, so it may be a long time __ we meet them again.

　　　　 A. when　　 B. while　　 C. since　　　 D. before

15. You are so sleepy in class now and you ____ late last night.

A. should have stayed up　　 　　　　　　　　　　　　 B. could have stayed up　　

C. might have stayed up　　 　　　　　　　　　　　　　 D. must have stayed up

14. In the end, one suggestion seems to be the solution ____ the problem.

　　 A. with　 　　B. to 　　C. for　 　　D. into