单项选择题

Now that you are seriously ill, you'd better stop ______.

A．smoking
B．to smoke
C．smoke
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单项选择题
Mary is from England. She teaches ______ English.
A．our
B．us
C．we
单项选择题
Be careful when you cross the street.______.
A．Yes, I will
B．Yes, I can
C．Yes, I am
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