单项选择题

The teacher's insistence ______ high standards resulted in excellent work.

A．on
B．in
C．to
D．with
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单项选择题
The boiling water in the kettle decreases because it ______ into vapor. In other words, it is vaporizing or evaporating.
A．is being converted
B．is converted
C．has been converted
D．converts
单项选择题
______, he doesn't always learn what he should do.
A．How a man ever so clever
B．A man is ever so clever
C．So clever as is a mail
D．No matter how clever a man is
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