单项选择题

No sooner had I closed the door than somebody started knocking ______ it.

A. on
B. with
C. to
D. for
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单项选择题
Living things are ______ cells, and cells do not grow to more than twice the size they were at first.
A. made from
B. made up of
C. made up from
D. made of
单项选择题
_______ in a recent science competition, the three students were awarded scholarships totaling $ 21,000.
A. Judged the best
B. Judging the best
C. To be judged the best
D. Having judged the best
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