单项选择题

John Smith, being a diligent student, never refuses to______ more responsibilities that are assigned to him.

A．take up
B．take in
C．take off
D．take on
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单项选择题
We felt______ to death because we could make nothing of the lecturer's speech.
A．exposed
B．tired
C．exhausted
D．bored
单项选择题
The captain of the ship ______the passengers that there was no danger.
A．assured
B．ensured
C．secured
D．insured
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