单项选择题

We can't choose whether we will pay income tax or not, for payment of income tax is ______.

A．compulsory
B．voluntary
C．arbitrary
D．dutiable
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More than 790,000 youths were reported to have ______ the National Master's Entrance Examination last year.
A．sat on
B．sat up
C．sat in
D．sat for
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At the 27th Olympic Games she ______ two gold and one silver medals in the track and field events.
A．carried away
B．carried off
C．carried over
D．carried through
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