单项选择题

The classroom needs ______.

A．clean
B．to clean
C．cleaning
D．being cleaned

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单项选择题

This invention is so great. ______.

A．So is it
B．So it is
C．Nor is mine
D．Nor is it

问答题

A manual worker probably earns more money than a man who does mental labor. For example, a brick-layer can earn more money than his next door neighbor who is a university professor. Yet, white-collar workers still have a higherreputation and social position than blue-collar workers even though they have lower pay.

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