单项选择题

A(An) ______ water supply for city people is already a problem no government can take lightly.

A．crude
B．adequate
C．fresh
D．original
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单项选择题
They failed to ______ the directors that their proposals would work, therefore all of their work is just a waste of time and effort.
A．convince
B．confirm
C．convert
D．control
单项选择题
He wrote in his will, after his death, the business would be handed ______ to his son.
A．on
B．over
C．out
D．in
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