单项选择题

The ______ is selling goods in the shop.

A． teacher
B． shop-assistant
C． worker
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单项选择题
Julia must ______ now, because the light of her room is turned off.
A． sleep
B． sleeping
C． be sleeping
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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