单项选择题

Professor Wilson has a speaking ______ for this weekend, so he declined the invitation by his friends for dinner.

A．employment
B．enhancement
C．engagement
D．assignment
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单项选择题
The ______ cost of the car, complete with tax and insurance, is ￡ 9,800.
A．including
B．inclusive
C．incorporating
D．containing
单项选择题
He thought tile door was locked, but he turned the ______ and the door opened.
A．knock
B．handle
C．knob
D．knot
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