单项选择题

You are too rigid: you must learn to change your plans when the situation _________ it.

A．calls on
B．calls for
C．calls forth
D．calls in
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单项选择题
Applications have poured in _________ assignments to remote regions of the country.
A．requiring
B．begging
C．requesting
D．awaiting
单项选择题
The clumsy movement of the giant panda amused all the _________.
A．visitors
B．witnesses
C．watchers
D．spectators
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