20. Why haven't you finished your homework yet? You___________ to have finished it by last Sunday.

A. are supposed　　　　　　　　　 B. were supposed　　

C. are supposing　　　　　　　　 D. were supposing

19. Could you give me a hand __________from the car, please?

A. to carry the shopping　　　　　　　

B. for carrying the shopping

C. and carrying the shopping　　　　　

D. carrying the shopping

18. --I'm told that John had another car accident this morning.

　　 --I believe not. He　 _________so careless.

A. shouldn't have been　　　 　　B. wouldn't have been

C. couldn't have been　　　　　 D. mustn't have been

17. The Bunsen Burner is so named because it is thought ___________ by Robert Bunsen.

A. to be invented　　　　　　　 B. having been invented

C. invented　　　　　　　　　　 D. to have been invented

16. --I didn't know this was a one-way street, officer. _________

A. That's all right.　　　　　　 B. I don't believe you.

C. How dare you say that?　　　 D. Sorry, but that's no excuse.

15. --Which play shall we go and see?

A. I'm afraid we can't B. I don't think it's interesting

C. Yes, I quite agree with you　　　　 D. I'll leave it to you

14. You _________think you're clever, but that doesn't give you the right to order me about!

A. should　　　 B. would　　　　 C. could　　　 D. might

13. --Jack's won _____________ holiday in London.　 --_________ lucky fellow !

A. a; A　　　　 B. the; The　　　 C. a; The　　 D. the; A

12. ____________ great help, I could get rid of all the difficulty and succeeded.

A. Offered　　　　　　　　　　　　 B. Having offered　　

C. Being supplied　　　　　　　　　 D. Having supplied

11. The reason__________ their failure you know is they didn't get fully prepared for the experiment.

A. why.., that　　　　 B. that.., why　　　　 C. for.., that　　　　　 D. why.., because