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A. It is B. It isn't C. This isn't
Be polite ____ others!
---Be polite . You _____ talk to the old like that ! ---Sorry , I won’t .
A. needn’t B. wouldn’t C. mustn’t D. couldn’t
A．to B．at C．about D．on
Be polite others!
A．to
B．at
C．about
D．for