单项选择题

In the experiment we kept a watchful eye ______ the developments and recorded every detail.

A. in
B. at
C. for
D. on
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单项选择题
He was ______ to admit his mistake even to his closest friend.
A. too much of a coward
B. too much the coward
C. a coward enough
D. enough of a coward
单项选择题
The face of the Moon is changed by collisions with meteoroids, ______ new craters to appear.
A. cause
B. causing
C. caused
D. have caused
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