单项选择题

It is important that she _____ a record of everything she does in the experiment.

A．keep
B．must keep
C．keeps
D．will keep
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单项选择题
nurses are wanted No tree could be seen here five years ago, but now over 60% of this district _____ covered by trees and greens.
A．are
B．has
C．have
D．is
单项选择题
Being watched by a lot of people, Alison felt very nervous, _____ what to say.
A．didn’t know
B．not knowing
C．and doesn’t know
D．not know
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