单项选择题

The citizens had no food supply when all the ( ) to this city had been cut off.

A.approaches
B.routes
C.itineraries
D.leads
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Many children have to drop out of school because their families cannot ( ) the tuition.
A.gain
B.afford
C.effort
D.offer
单项选择题
We could have gone on a picnic if the weather ( ) nice.
A.was
B.will
B.is
D.had
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