单项选择题

Children tend to rely on ______ school friends to keep in touch with schoolwork.

A．concern
B．concerning
C．concerned
D．to concern
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单项选择题
The present ______ of supplies will be alleviated when new shipments arrive.
A．limit
B．scarcity
C．confinement
D．restriction
单项选择题
______, the two parties will have the same amount of luck to win the election.
A．All other things are equal
B．Were all other things equal
C．All other things being equal
D．If all other things were equal
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