单项选择题

While driving, drivers must keep an eye on what is happening （）

A．in other cars
B．on the phone
C．around them
D．at home

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单项选择题
The development of the light bulb （） partly as a result of the widespread availability of electricity and the need for cheap, cicada light.

A. occurring
B. was occurring
C. was occurred
D. occurred
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