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 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
单项选择题
Ireland's total primary energy requirements ten years ago amounted to 8 billion tons of oil equivalent, ______ 38% was produced from indigenous sources.
A．which
B．of which
C．part of which
D．out of which
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