单项选择题

—Look! He"s running so fast!
—Hard to ______ his legs were once broken.

A．know
B．realize
C．find
D．imagine
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单项选择题
We should be able to do the job for you quickly, ______ you give us all the necessary information.
A．in case
B．provided that
C．or else
D．as if
单项选择题
It was clever ______ at the answer in two minutes.
A．of him to arrive
B．for him to arrive
C．for his arriving
D．of his arriving
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