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
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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
单项选择题
What is he He is ______.
A．a teacher and writer
B．a teacher and a writer
C．teacher and writer
D．the teacher and writer
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