单项选择题

If headaches only occur at night, lack of fresh air is often the cause.

A．start
B．begin
C．happen
D．visit
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单项选择题
The policemen acted quickly because lives were at stake.
A．in despair
B．in danger
C．in misery
D．in pain
单项选择题
We are surethat he will get over his illness.
A．certain
B．aware
C．happy
D．determined
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