单项选择题

As we know, physics ______ the science of energy.

A．was
B．were
C．is
D．are
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单项选择题
It was not until the accident happened ______.
A．when I became aware of my foolishness
B．when my foolishness became obvious
C．that did I realize my foolishness
D．that I became aware of my foolishness
单项选择题
The forest guards often find campfires that have not been ______ completely.
A．turned down
B．put out
C．put away
D．turned over
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