单项选择题

The（）of freedom is eternal vigilance (警惕).

A、 cost
B、 value
C、 expense
D、 prize

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单项选择题

I then listened to the boy（）the person written on the blackboard.

A、 being read
B、 to read
C、 reading
D、 read

单项选择题

Urban congestion would be greatly relieved if only the（）charged on public transport were more reasonable.

A、 prices
B、 tickets
C、 fees
D、 fares

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