单项选择题

You'd better ______ your bed before having your breakfast, Sam!

A．do
B．make
C．clean
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Julia must ______ now, because the light of her room is turned off.
A．sleep
B．sleeping
C．be sleeping
单项选择题
My aunt will arrive here tomorrow. ______ is 50 years old.
A．He
B．She
C．It
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