单项选择题

_______ is to arrange them in groups or sequences according to a plan.

A．Things classified
B．In classifying things
C．As classification of things
D．To classify things
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单项选择题
The government asked the people to be sure to avoid _______ any water which had not been boiled.
A．drinking
B．to drink
C．having drink
D．not to be drunk
单项选择题
Maggie tiptoed over and took the clock away because she hated to hear it _______ when she was trying to go to sleep.
A．sounding
B．humming
C．ticking
D．ringing
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