单项选择题

One of the requirements for a fire is that the material ______ to its burning temperature.

A．is heated
B．be heated
C．will be heated
D．has been heated
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单项选择题
Primary batteries of cells are those that, once ______, are discarded.
A．to be discharged
B．being discharged
C．discharged
D．discharging
单项选择题
The boy was ______ by a milk float and taken to hospital.
A．run off
B．run out
C．run over
D．run through
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