单项选择题

The examination has been cancelled. You ______ all that review, after all.

A．didn't need to do
B．needn't do
C．needn't have done
D．needn't to do
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单项选择题
Most insulation devices of this kind, ______ manufactured for such purposes, are extremely expensive to install.
A．that are
B．which is
C．those are
D．as are
单项选择题
It is very plain that such a life as this is far more ______ to health than that of the man who can afford little leisure for necessary rest in the course of the day.
A．conductive
B．constructive
C．conciliate
D．conducive
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