单项选择题

They were (used to) (hear) him (singing) in a cheerful voice in the classroom when he thought (no one) was near.

A．used to
B．hear
C．singing
D．no one
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单项选择题
(Not single) alphabet has (ever) perfectly represented the sounds of (any) of the (Earth's) natural languages.
A．Not single
B．ever
C．any
D．Earth's
单项选择题
You can take anything from the shelf and read, but please ______ the books when you've finished with them.
A．put on
B．put down
C．put back
D．put off
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