sure 做定语时表示“可靠的、稳妥的”。 come to 谈到，提及。

37. Careful surveys have indicated that as many as 50 percent of patients do not take drugs _D_ directed.
A like   B so   C which   D as
drug n. 药品，毒品。 gay adj. 放荡的，快乐的； n. 同性恋者，尤指男性同性恋。
so后面加过去分词表示一种程度。 as后面加过去分词时表示“如同…那样，正如…那样”。

53. I hope all the precautions against air pollution, _D_ suggested by the local government, will be seriously considered here.
A while   B since   C after   D as
precautions n. 防治措施； precautions against 防治…的措施。
after being + 过去分词，注意：after后面不能直接加过去分词。

38. In developing countries people are _C_ into overcrowded cities in great numbers.
A breaking   B filling   C pouring   D hurrying
pour into 涌入，蜂拥而入。 break into 强行闯入。

39. It's reported that by the end of this month the output of cement in the factory _A_ by  about 10%. [output 产量]
A will have risen   B has risen   C will be rising   D has been rising
表达将来的行为在将来某时间之前完成用将来完成时。

40. If I had remembered _A_ the window, the thief would not have got in.
A to close   B closing   C to have closed   D having closed
remember to do sth. 记得要做某事但没做。

41. There are other problems which I don't propose to _A_ at the moment.
A go into   B go around   C go for   D go up
at the moment 目前，现在。 go into 谈论，讨论。

42. Don't get your schedule _C_; stay with us in this class.
A to change   B changing   C changed   D change

43. It is quite necessary for a qualified teacher to have good manners and _A_ knowledge.
A extensive   B expansive   C intensive   D expensive
extensive adj. 范围广大的，广博的； extensive knowledge 知识渊博。
expansive adj. 扩张的，面积广阔的； expensive adj. 昂贵的，高价的。
intensive adj. 仔细深入的，细致入微的。

54. The patient's health failed to such an extent that he was put into _C_ care.
A tense   B rigid   C intensive   D tight
to such an extent 到如此的程度。 intensive care 特级护理。

44. Jean doesn't want to work right away because she thinks that if she _B_ a job she probably wouldn't be able to see her friends very often.
A has to get   B were to get   C had got   D could have got

46. A love marriage, however, does not necessarily _B_ much sharing of interests and responsibilities. [a love marriage因相爱而结婚形成的婚姻]
A take over   B result in   C hold on   D keep to
not necessarily 未必； interests n. 利益。 take over 接管，接收；
result in 导致，结果是； hold on 坚持，挺住； keep to 坚持，遵守。

47. The ability to store knowledge makes computers different form every other machine _A_ invented.
[ever adj. 曾经，以往任何时候]
A ever   B thus   C yet   D as

48. I'm not sure whether I can gain any profit from the investment, so I can't make a(n) _C_ promise to help you.
A exact   B defined   C definite   D sure
definite: unlikely to be changed 不可能被改变的； definite promise 不可能被改变的诺言。

49. I have kept that portrait _B_ I can see it every day, as it always reminds me of my university days in London.
A which   B where   C whether   D when
which在定语从句中除了做主语就是做宾语，when在定语从句中只能做时间状语。
remind sb. of sth. 使某人想起某事。

50. The sports meet, originally due to be held last Friday, was finally _D_ because of the bad weather. [sports meet=sports meeting 运动会]
A set off   B broken off   C worn off   D called off

21. Until then, his family _D_ from him for six months.
A didn't hear   B hasn't been hearing   C hasn't heard   D hadn't heard