单项选择题

The forest fire caused by the volcano is difficult to be______.

A．put off
B．put away
C．put out
D．put up
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单项选择题
We shall ask for samples ______and then we can make our decision.
A．to be sent
B．being sent
C．to sent
D．to have been
单项选择题
Today books are ______to everyone because they are no longer expensive.
A．available
B．preferable'
C．reliable
D．actual
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