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--What about going for a walk? ---（）

A.Why not? A good idea
B.That’s all right
C.So, do I
D.Walking is good to you

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Why（）the old block of flats（）demolished next month?

A.are;being
B.is;being
C.has;been
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The sun heats the earth,（）is very important to living things.

A.that
B.what
C.which
D.where