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21、—Ouch! You hurt me!  

—I am sorry. But I    any harm. I    to drive a rat out.

A. didn’t mean; tried         B. didn’t mean; was trying  

C. haven’t meant; tried       D. don’t mean; am trying

20、The teacher _____have thought Johnson was worth it or she wouldn't have wasted time on him, I suppose.

A. should          B. can           C. would          D.  must

19、At minus 130℃, a living cell can be ______ for a thousand years.

A. spared        B. protected           C. preserved          D. developed

18、Surely it doesn’t matter where the student associations get their money from; what      is what they do with it. 

A. counts              B. applies                C. stresses                       D. functions

17、—Could you tell me the way to ____ Johnsons, please?

—Sorry, we don’t have ____ Johnson here in the village.

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

16、My morning ______ includes jogging in the park and reading newspapers over breakfast.

A. drill            B. routine    C.  regulation        D. action

15、AIDS control and prevention is a    to China as well as the whole world.

A. surprise             B. reaction           C. challenge          D. threat

14、It is not socially ____________ for parents to leave children unattended at that age. 

A. accessible                      B. acceptable

C. adaptable                      D. adorable

13、Although the country has had political independence for over a century,    it needs the support of its neighbors. 

A. naturally         B. economically        C. especially        D. luckily