单项选择题

The gas company ______ a leak in the main line and evacuated all the tenants of the building.

A．detected
B．inspected
C．discerned
D．explored
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单项选择题
It's always better to ______ a problem before it arises than to search for a solution to it afterwards.
A．evaluate
B．predict
C．anticipate
D．estimate
单项选择题
My secretary has typed out the first ______ of the report, but I must revise it before I submit to the conference.
A．draft
B．sketch
C．script
D．outline
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