单项选择题

There is still, ______ for improvement.

A．the room
B．room
C．a room
D．rooms
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单项选择题
It is very difficult to give ______ smoking.
A．in
B．up
C．off
D．out
单项选择题
Many workers were thrown into ______ when the factory closed.
A．unemployment
B．debts
C．danger
D．failure
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