单项选择题

Whenever work is being done, energy ______ from one form into another.

A．converts
B．converted
C．is converted
D．is being converted
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单项选择题
He is ______ drinker, who has been imbibing for so long that he has figuratively speaking, grown old with the vice.
A．an inveterate
B．an incorrigible
C．a chronic
D．an unconscionable
单项选择题
The detective watched and saw the suspect ______ a hotel at the corner of the street.
A．getting off the taxi and walking into
B．got off the taxi and walked into
C．get off the taxi and walk into
D．got off the taxi to walk into
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