单项选择题

All students in the class ______ a loud laugh when the professor told them a joke.

A．let up
B．let down
C．let off
D．let out
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单项选择题
We've ______ all our time and effort in this plan, and we don't want it to fail.
A．invested
B．exhausted
C．devoted
D．assigned
单项选择题
Without a sure supply of water, fanning in that area remains at the ______ of the weather.
A．disposal
B．risk
C．cost
D．mercy
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