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
The clumsy movement of the giant panda amused all the ______.
A．visitors
B．witnesses
C．watchers
D．spectators
单项选择题
They must ______ for us; let's hurry up.
A．wait
B．have been waited
C．waited
D．be waiting
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