单项选择题

______ your homework and make sure that you don't ______ any mistakes.

A．Do; do
B．Make; make
C．Make; do
D．Do; make
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单项选择题
Because the company was doing more business, it was necessary to ______ the factory.
A．extend
B．increase
C．rise
D．lookers
单项选择题
No sooner had I closed the door than somebody started knocking ______ it.
A．on
B．with
C．to
D．for
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