单项选择题

The severe flood ______ damage to the people, had we not built so many reservoirs.

A．can cause
B．might have caused
C．had caused
D．must have caused
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单项选择题
It is ______ of you to walk down the street alone at midnight.
A．efficient
B．proud
C．bold
D．greedy
单项选择题
Children are always happy. They can play ______.
A．for their heart's content
B．for their heart content
C．to their heart's content
D．to their hearts' content
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