单项选择题

The nursing staff are exhausted; they've been _________ all weekend.

A．on call
B．on guard
C． on line
D．on patrol
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单项选择题
_________ her pen in ink, when she heard the tramping of little feet along the hall, and then a pounding at her door.
A．No sooner has she dipped
B．Scarcely had she dipped
C．As soon as she had dipped
D．Hardly she has dipped
单项选择题
Time and money pressures often push you into at least a few _________ decisions that you are not happy with later.
A．instant
B．prompt
C． hasty
D．urgent
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