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47. He would like to view difficulties _____ a kind of challenge. A． with B． on C． of D． as… as） 108 .You cannot ______ yourself against all risks and dangers. A.secure 保护，使安全 B. leave C.let D.save 124. Plenty of fresh air _____ to our good health. A.continues B.contributes C.convinces D.conveys 292. He must be very tired today; he doesn’t seem to _______ on the discussion. A.concentrate B.rely C.put D.depend 329. He was absent-minded. He ______ be thinking about the question you raised. A. might B. must C. may D. should 340. The teacher told the children that water ____ at 100 degree Centigrade. A. was boiling B. boiling C. boils D. boiled 348. We were all surprised when he made it clear that he ____ office soon. A. left B. would leave C.leaves D.had left 355. Do you know how large ___ is? A. population of China B.China’s population C.China population D.Chinese population 481. Mr. and Mrs. Smith didn’t expect the house _____ so well. A.to paint B. to be painted C.painting D.be painted　　 497 .The government official explained that there’s no point __ worrying about the cultural gap in that city. （there’s no point in doing sth做某事没有作用或没有意义 A. at B. in C. for D.on 546. When they got to the lecture-room, there were ______ left. A. only a few seats B.only few seats C. not a few seats D.a very few seats 552. Besides, protecting the environment is a serious ______. A.event B.matter C.incident D.affair 596. A pretty face may win friends but it takes character and personality to hold ______. A. it B. them C. one D. that 837. She is older than ______. A. any other girl in the group B. the group C. any girl in the group D. all girls in the group 845. A red pencil-mark on the fifth page caught his ______. A. eye B. watch C. ears D. look 849. The second thing we noticed was that the park looked a lot ______ beautiful than we thought. A. less B. many C. much D