单项选择题

We do not permit ______ in the office, so we do not permit him ______ here.

A．to smoke; to smoke
B．smoking; to smoke
C．smoking; smoking
D．to smoke; smoking
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单项选择题
After I paid the money, the shop assistant gave me a ______.
A．receipt
B．reception
C．receiver
D．receptor
单项选择题
The ______ salary of the staff is about ＄ 50.
A．usual
B．average
C．equal
D．common
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