单项选择题

In his ______to further his knowledge of the universe, man has now begun to explore space.

A．endeavor
B．expedition
C．trail
D．chase
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单项选择题
They must ______for us; let's hurry up.
A．wait
B．have been waited
C．waited
D．be waiting
单项选择题
The old couple were not rich themselves, but they hated to turn away anyone who were ______food and shelter.
A．at the mercy of
B．on the point of
C．with the exception of
D．in need of
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