单项选择题

In time of danger, David came to lend ______ and we smoothly carried out the plan in the end.

A．at hand
B．by hand
C．a hand
D．on hand
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单项选择题
This is the microscope _______ which we have had so much trouble.
A．at
B．from
C．of
D．with
单项选择题
Because of the reduction of air pollution, this city now is a good place _______
A．where to live
B．which to live
C．to be lived
D．to live
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