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4.Everyone is supposed to __________(积极参力卩) protecting wild animals.

4. take an active part in 

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2.不管你相信还是不相信，这是真的。

__________________，it is true.

4.    he failed in the drive test,he never gave up.

10. When I passed by,he seemed __________(write) a letter.

6.The police haven't found the exact s__________ where the girl was murdered.

6.We agree that the problem is__________(worth) to be discussed.

5. He had given his life__________ save that girl.

6.This is the teacher whom we have learnt a lot.

3.他三天没睡了，怪不得他很疲倦。

He hasn't slept at all for three days.         he is tired out.

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