单项选择题

The building started with a steel ______ which was later filled in with bricks and concrete.

A．institution
B．terminal
C．sightseeing
D．framework
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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
单项选择题
There are certain ______ when you have to interrupt people who are in the middle of doing something.
A．chances
B．situations
C．occasions
D．opportunities
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