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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

10. --Why has he been staying at home these days?

　　 --He ___________ since a month ago.

　 A. has been out of work　　　　　　 B. was out of work

　 C. has lost his work　　　　　　　 D. had left from his work

9. The president of the country was well of when he was in power.

A. praised　　 B. fond　　 C. appreciated　　 D. thought