单项选择题

You should turn off all the water tonight ______ water freezes and the pipes burst.

A．in some cases
B．in case
C．in that case
D．in any case
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______ is well known, light, like heat, is a form of energy.
A．It
B．What
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All the machines ______ by the end of the following week.
A．were repaired
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