单项选择题

We must be ______ our guard against this kind of disease.

A．on
B．in
C．with
D．for
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单项选择题
There is a (n) ______ cottage on the slope of that mountain.
A．old little white
B．old white little
C．white old little
D．little old white
单项选择题
There is not much ______ left for those books on the shelf. Better clear some away.
A．place
B．area
C．space
D．room
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