单项选择题

It is widely believed that the pull of gravity on a falling raindrop changes ______ round shape into a teardrop shape．

A．of the drop
B．the drop's
C．drop of
D．drops the
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单项选择题
It seems to me that what Lucy saw and heard ______ very interesting.
A. was
B. were
C. is
D. are
单项选择题
He is very tired．He needs ______．
A．a night rest
B．a rest night
C．a night's rest
D．a rest of night
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