61He is studying diligently________he should fall behind.
A.for fear that
B.so that
C.unless
D.as long as
开始考试练习点击查看答案62________he retires, Prof.Baker will have taught in the university for almost forty years.
A.By this time
B.At the time
C.At the same time
D.By the time
开始考试练习点击查看答案63We must improve the farming method________we may get high yields.
A.in order to
B.in order that
C.since
D.as
开始考试练习点击查看答案64After you finish reading, be sure to place the book________it used to be.
A.immediately
B.where
C.when
D.though
开始考试练习点击查看答案65________you try to do something beyond what you have already mastered, you will never grow.
A.Once
B.If
C.Because
D.Unless
开始考试练习点击查看答案66Traditional exercise like sit-ups is great for strengthening the body,________you do it properly.
A.since
B.as though
C.providing
D.considering
开始考试练习点击查看答案67I still like him,________he makes me angry sometimes.
A.though
B.as
C.if
D.where
开始考试练习点击查看答案68Many candidates lose marks simply________they do not read the questions properly.
A.because
B.so
C.since
D.Unless
开始考试练习点击查看答案69The passengers will wait here________the next bus arrives.
A.until
B.since
C.as
D.although
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