单项选择题

It is obviously necessary that both the President and his advisers ______ down to earth.

A．will be
B．should be
C．would be
D．must be
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单项选择题
The incredible precision of the equipment is ______ to the mechanical skill of the engineers who built it.
A．testimony
B．symbol
C．evidence
D．attribute
单项选择题
Three hours has passed since tile discussion was begun, and I'm afraid they will ______ it still longer.
A．expand
B．stretch
C．protract
D．extend
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