单项选择题

Why not ______ your schoolbag before you go to school

A．check
B．checking
C．to check
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单项选择题
There are some very useful ______ in the mountains.
A．pills
B．medicines
C．minerals
单项选择题
Bread and milk ______ the best breakfast for children.
A．be
B．is
C．are
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