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C: with the alert D: on the alert 正确答案:

(单选题) 43: It would be completely irresponsible and unethical to use drugs on people that had not been thoroughly tested ________animals. A: at B: on C: among D: within 正确答案:

(单选题) 44: Attempts to ______this old system have been made in every presidential election in the past one hundred years, but the system has survived all assaults. A: break down B: break in C: break up

D: break through 正确答案:

(单选题) 45: He made a request _______immediate help. A: at B: for C: on D: by

正确答案:

(单选题) 46: ____the drill is, it is very useful in improving your oral English. A: Simple you consider B: You consider simple C: Simple as you consider D: As simple you consider 正确答案:

(单选题) 47: Only when I got there____how badly the crops had been damaged. A: did I realize B: I realized

C: then I realized D: then did I realize 正确答案:

(单选题) 48: We do not have a____school in our institute. The highest degree we provide for the students is a B. A. and a B. S. A: continue B: bay

C: assistance D: graduate 正确答案:

(单选题) 49: He’ll always be ____ to you for what you’ve done. A: peaceful B: secure C: grateful D: companion 正确答案:

(单选题) 50: Historically, scientists and inventors are one group that seem to take full________of relaxed moments. A: use B: chance C: advantage

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D: attention 正确答案:

(单选题) 1: There were some chairs left over _____ everyone had sat down. A: when B: until C: that D: where 正确答案:

(单选题) 2: I always associate this song_______my school days. A: by B: to C: with D: in

正确答案:

(单选题) 3: He used to_________at the River Seine and the golden reflections of the setting sun to establish an atmosphere for creativity. A: gaze B: gazing C: be gazed D: being gazed 正确答案:

(单选题) 4: Jack often complains____able to communicate with his parents. A: of being not B: of not being C: being not D: not being 正确答案:

(单选题) 5: You'd better ________things ________if you don't know how to deal with them. A: to leave ... Alone B: leave ... Lonely C: leave ... Alone D: to leave ... Lonely 正确答案:

(单选题) 6: The manager believes prices will not rise by more than _____ four percent. A: any other B: the other C: another D: other