单项选择题

There are some trees on ______ side (s) of the street.

A．both
B．every
C．either
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单项选择题
--Must I turn off the light when I leave --No, ______
A．you mustn't
B．you can't
C．you needn't
单项选择题
This pencil is ______.
A．my brother's one
B．my brother's
C．my brother one
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