多项选择题

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

A．on guard
B．on call
C．on line
D．on patrol
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单项选择题
If GIBE-FADE=81, then DICE-CEDE=
A．53.
B．54.
C．55.
D．56.
单项选择题
Sally likes 225 but not 224; she likes 900 but not 800; she likes 144 but not 145. Which does she like:
A．1500
B．1600
C．1700
D．1800
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