My mother's _______ used to be black, but now there ________ .

[　　]

A. hairs, are some white ones

B. hair, are white hairs

C. hairs, is some white hair

D. hair, is some grey hair

Sun Yanzi is most famous ________ the young people in Asia _______ her pop songs.

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What are the names of the school subjects _______ you study sciences?

[　　]

The money you spend _______ cigarettes would be better spent _____ a motocycle.

[　　]

“May I go home, sir?”she said _______ low voice.

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The new train has no wheels _____ no engine. It can travel fast enough ______ planes do.

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Better use should be ________ new technologies ________ our life easy and comfortable.

[　　]

Don't waste time ________ with him; he will never change his mind.

[　　]

--Was the speech long enough?

--No, it wasn't _____ enough.

[　　]

A. much too long

B. too much long

C. too long much

D. quite long

When having an exam, try to make _____ mistakes as possible.

[　　]

A. as few

B. as fewest

C. as fewer

D. so few