31. After many years of observation and research, the scientists finally came to a(n) ________ that there’s no condition for man to live on Mars.

A. end　　　　　 B. decision　　　 C. conclusion　　　 D. understanding

30. Always remember to _______ before you make an important decision.

A. take it into consideration　　　　 B. put it into your consideration

C. get it into consideration　　　　　 D. push it into your consideration

29. The early ________ of patients with cancer-cells treatment matters a lot.

A. discovery　　　 B. identification　　 C. conclusion　　　 D. shapes

28. This is a kind of bamboo, which __________ green grass in appearance.

A. likes　　　　　 B. appears　　　 C. resembles　　　 D. exposure

27. At the meeting I asked her opinion, but she just asked me a question ____________.

A. in return　　　 B. in turn　　　 C. in surprise　　　 D. in doubt

26. Jack, the computer company needs some graduates. Why not _______ a possible position.

A. hope for　　　 B. apply for　　　　 C. ask about　　　 D. announce about

25. __________ farm on this island will, of course, become rich in the near future.

A. Enough hard-working people　　　 B. Hard-working enough people

C. People enough hard-working　　　 D. People hard-working enough

24. ____________ you have been sent abroad to study ,you might as well make full use of the good chance.

A. Because　　　　　　　 B. As soon as

C. The moment　　　　　 D. Now that

23. We got a flat tire on our way back home or we ______________home an hour early.

A. were able to get　　　　　 B. would have got

C. should have got　　　　　 D. must have got

22. -Does the boy over there work in your garage?

　 -No, he ___________ till Jack comes back, who’s out on business for more petrol.

A. is just helping　　 　　　　B. just works here

C. has been helping　　　　　 D. won’t work here