单项选择题

You can do it if you want to, but in my opinion it's not worth the ______ it involves.

A．effort
B．strength
C．attempt
D．force
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单项选择题
The little boy's face was ______ from his toothache.
A．bulging
B．swollen
C．expanded
D．extended
单项选择题
I could hardly ______ the road in the dense fog.
A．differentiate
B．distract
C．disclose
D．discern
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