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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单项选择题
The workers' demands were ______ , they only asked for a small raise in their wages.
A．general
B．moderate
C．partial
D．numerous
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
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