单项选择题

All of a sudden, we saw the aircraft ______ and burst into flames.

A．crash
B．fall
C．drop
D．break
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单项选择题
Put your things ______ you can easily find them.
A．where
B．in where
C．in which
D．in a place
单项选择题
The kindergarten kids were greatly ______ by the story- teller's jokes.
A．amused
B．pleased
C．entertained
D．cheered
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