单项选择题

The boy's father built them a large sandbox _______.

A．to play in
B．to play in it
C．to play in there
D．in which to play in there
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单项选择题
_______ its weights is the Earth's gravitational attraction for the particular mass..
A．When it gives matter
B．Matter is given
C．What gives matter
D．How it is given matter.
单项选择题
The government is doing a _______ of people's changing social habits.
A．plan
B．survey
C．project
D．research
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