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
We can't _____________ the possibility that Mary was murdered by her husband.
A．run out
B．drop out
C．rule out
D．hand out
单项选择题
To our surprise, the stranger _____________ to be an old friend of my mother's.
A．turned into
B．turned out
C．turned over
D．turned up
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