单项选择题

The bookshelf is so crowded that we have to dispose _____________ this pile of old papers and magazines.

A．about
B．to
C．with
D．of
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单项选择题
If you want to _____________ that you get the diploma, you have to work harder and take all these courses and pass all the exams.
A．ensure
B．assure
C．insure
D．secure
单项选择题
Do not leave the building unless _____________ to do so.
A．instructed
B．being instructed
C．are instructed
D．have instructed
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