Be careful when you take exams. Check your paper to there are no mistakes before you hand it in.
A. make sure
B. find out
C. think about
D. deal with
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(答案→)A. make sure
B. find out
C. think about
D. deal with
解析：考查固定短语。make sure意为：确保，find out 搞清楚，弄明白。Think about 考虑；deal with 处理。句意：当你考试的时候，要认真。在你交试卷之前，检查你的试卷确保没有错误。故选A。