22、With the help of high technology, more and more new substances ______ in the past years.
A. discovered B. have discovered
C. had been discovered D. have been discovered
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