单项选择题

Something must be clone ______ pollution, otherwise the world won't be fit for people to live in.

[A] with
[B] for
[C] about
[D] on

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单项选择题

Most of his books ______ in this small room.

[A] are kept
[B] is kept
[C] keeps
[D] keeping

单项选择题

I ______ on a maths problem when he telephoned me early this morning.

[A] had worked
[B] was working
[C] have worked
[D] have been working

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