46.Sandy could do nothing but _____ to his teacher that he was wrong.
　　A.admit B.to express C.admitting D.to admit
　　答案A 桑迪无事可做，除了向老师认错 选A，句中的but不是连词“但是”，而是介词“除…之外”，当前面有实义动词do的不同形式时，后面用but do sth.;否则，则要用but to do sth.结构，故只能选A，“桑迪无事可做，除了向老师承认他错了。”，再如：He could do nothing but stay at home. I have no choice but to study hard.
　　47.I'm going to the supermarket this afternoon.Do you have anything _____?
　　A.to be buying B.to buy C.for buying D.bought
　　答案B 我下午要去超市，你有什么东西要让我买吗?
　　48.She will tell us why she feels so strongly that each of us has a role _____ in making the earth a better place to live.
　　A.to have played B.to play C.to be played D.to be playing
　　答案 B 他将告诉我们为什么，她会对我们每人所扮演的把地球打造的更适宜生存的角色有如此强烈的感觉。
　　49.In order to gain a bigger share in the international market, many state-run companier are striving _____ their products more competitive
　　A.to make B.making C.to have made D.having made
　　答案A 为了在国际市场中增加更多的市场，许多国有企业努力使他们的企业更具有竞争力。
　　50.An army spokesman stressed that all the soldiers had been ordered _____ clear warning before firing any shots.
　　A.to issue B.being issued C.to have issued D.to be issued
　　答案A 一位军队发言人强调说，所有士兵没被要求在开火射击之前都要发出清晰的警告 to issue发放
　　51.As a commander you should not _____ the soldiers to unnecessary danger.
　　A.express B.explode C.exploit D.expose
　　答案：D.expose作为一个指挥官不应该暴露士兵不必要的危险。expose…to固定搭配
　　52. This newspaper often _____ the government‘s opinion, not the public opinion.
　　A.affects B.reacts C.reflects D.recognizes
　　答案：C.reflects这家报纸经常反映政府的意见，而不是民意。
　　53.Although in great danger, the wounded still did not want to _____ from the front.
　　A.feedback B.backward C.withdraw D.departure
　　答案：C.withdraw虽然在巨大的危险，伤员仍然不想从前线撤回。
　　54.This movie has a _____ ending. You can not imagine who will be killed finally.
　　A.dramatic B.original C.considerable D.temple
　　答案：A.dramatic这部电影有一个戏剧性的结局。你无法想象，谁终会被杀死。
　　55.During the graduation _____, the president gave a wonderful opening speech.
　　A.evolution B.sign C.individual D.ceremony
　　答案：D.ceremony在毕业典礼上，主席发表了精彩的开幕词。