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 rest （） of this TV play will be broadcast next week.

A．prelude
B．episode
C．incident
D．accident
单项选择题
The waste pipe is blocked; try （） it out with hot water, or just call the plumber to do it.

A．flushing
B．crushing
C．brushing
D．blushing
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