单项选择题

______ carefully, it will last at least about five years.

A．Using
B．To use
C．Used
D．Use
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单项选择题
Your father used to work from 7:00 a.m. to 16:00 p.m., ______
A．didn"t he
B．doesn"t he
C．used not
D．did he
单项选择题
We are planning to build ______ language labs.
A．two another such
B．other two such
C．such two other
D．another two such
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