A. would be killed

　　B. would have been killed

　　C. was killed

　　D. had been killed

　　16. Hey, look at your pale face; you must have stayed up late last night, ______?

　　A. have you

　　B. haven’t you

　　C. did you

　　D. didn’t you

　　17. He may not be the best choice. But before ________ is found, we will have him receive training in the team.

　　A. a good one

　　B. a better one

　　C. the best one

　　D. a best one

　　18. —Mike, this is the third time that you have been late this week.

　　—Sorry, sir, but I was_________ for 15 minutes on the way here in the traffic jam. A. held up           

　　B. put up            

　　C. taken up           

　　D. given up

　　19. You should realize the fact that when you graduate from university, you are still not prepared for the possible situations ___________ you may face in the working world.

　　A .where

　　B. that

　　C. what

　　D. when

　　20. There is convincing evidence that __________ to sunlight too long without any protection will cause skin cancer.

　　A. exposing

　　B. exposed

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