单项选择题

All ______is a continuous supply of electric power.

A) that is needed
B) what is needed
C) which is most important
D) for our needs
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单项选择题
Students always keep candles in their rooms ______ there is a power cut.
A) in case
B) in no case
C) in the case of
D) in case of
单项选择题
It is useful to be able to predict the extent ______ which a price change will affect supply and demand.
A) with
B) from
C) for
D) to
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