单项选择题

They were at work when they received ______ SOS from ______ school, and they immediately started their police cars.

A．the,the
B．a,a
C．an,a
D．the,a
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单项选择题
A good ______ of animals hibernate and during their hibernation they eat ______.
A．deal, a little
B．number, a few
C．deal, few
D．number, little
单项选择题
______ more attention, the young trees could have grown much letter.
A．To give
B．Given
C．Giving
D．Having given
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