单项选择题

______ is human nature, that people don't cherish the things they have until they lose it.

A．It
B．Such
C．That
D．This
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单项选择题
They are well ______ with each other since they were little kids living in the same community..
A．identified
B．recognized
C．acknowledged
D．acquainted
单项选择题
We have not obtained very much experiment data ______ conclusion between the two possibilities.
A．on which to base
B．to base on
C．which is based on
D．to be based on
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