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55. Something must be done to prevent our city ____ by thick smoke.

A. to be polluted 　 　B. from polluting　　 C. from being polluted　　 D. polluting

54.To tell you the truth, I have nothing to do ____ it.

A.about　　　　 B.with　　　　　　　　　 C.for　　　　　　　　　　 D.of

53. Did you have any trouble ____ the post office?

A. to have found 　　　　　 B. with finding　　　　 C. to find　　　　　 D. in finding

52. - How long has the bookshop been in business?　　　　　　　　　 -____1982.

A. After　 　　　　 B.In　　　　　　　　　　　 C.From　　　　　　　　 D.Since

51. He looked quite healthy ____ he was ____ the age of seventy.

A. when; at　　 　 B. because; in　　　　 C. if; for　　　　　　　　 D. though; at

50. Does John know any other foreign languages ____ French?

A. except　　　 　 B. but　　　　　　　　　　 C. besides　　　　　　　 D. beside

49. The old man died ____ cold ____ a cold night.

A. from; at　　　 　 B.of;in　　　　　　　　　 C.of;on　　　　　　　　 D. for; during

48. The trees ____ front of the house are ____ the charge of Old Li.

A. in; in　　　　 B. at; in　　　　　　　　　 C. in; by　　　　　　　　 D. from; in

47. I made the coat ____ my own hands. It was made ____ hand, not with a machine.

A. in; in　　　　 　 B.in; with　　　　　　　 C. with; by　　　　　　 D. with; with

46. - Do you go there ____ bus?　　　　　 - No, we go there ____ a train.

A. in; on　　　 　　 B.on;on　　　　　　　　 C.by;in　　　　　　　　　 D.by; with