单项选择题

From the writer's observation, we can see that fires break out in Tokyo ______.

A．occasionally
B．quite frequently
C．not very often
D．twice a day
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Many a man ______ life is meaningless without a purpose.
A．think
B．thinks
C．is thinking
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The classroom needs ______.
A．clean
B．to clean
C．cleaning
D．being cleaned
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