单项选择题

Robert seemed to be _____________ of deciding anything for himself.

A．incompetent
B．ineffective
C．unable
D．incapable
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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
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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