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
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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
单项选择题
If your neighbors are too noisy then you have cause for _____________.
A．annoyances
B．complaints
C．moans
D．remarks
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