33. As your instructor(教师) advised, you ought to spend your time on something ____ researching into.

A. precious　　 B. worth　　 C. worthy　　　 D. valuable

32. _____ the fact that his initial(开始的)experiments had failed, Pro. White persisted (坚持) in his research.

A. Because of　　　 B. As to　　　 C. In spite of　　 D. In views of

31. -------Do you have enough to ________ the cost of your board at school?

-------Oh yes, enough and to spare.

A. cover　　　　 B. spend　　　 　C. fill　　　　 D. spare

30. When I talked with my grandma on the phone, she sounded weak, but by the time we ___ up, her voice had been full of life.

A. were hanging　 B. had hung　 C. hung　　 D. would hang

29. Gun control is a subject　 　　　　Americans have argued for a long time .

A. of which　　 B. with which　　 C. about which　　 D. into which

28. It is generally said that man’s desire is hard _______.

A. to satisfy　　 B. to be satisfied　　 C. to met　　 D. to being satisfied

27. Every evening after dinner, if not 　　　　from work, I will spend some time walking my dog.

A. being tired　 B. tiring C. tired 　 D. to be tired

26. Doctors recommend that all children ________ vaccinated against measles(麻疹).

A. should　　 B. could be　　 C. are　　 D. be

25. Practising Chinese kung fu can not only 　　　　　one’s strength, but also develop one’s character.

A. bring up　　 B. take up　 C. build up　　 D. pull up

24. The government claims that the economy is improving, but this survey suggests ________.

A. moreover　 B. therefore　 C. otherwise　 D. meanwhile