2. I’ve phoned you several times. What __________ are you doing?

1._________ you’ve finished your homework, you can go and play football to have a rest.

10. The force that attracts objects in space towards each other, and on the earth pulls them towards the center of the planet is called ____________ (重力).

Exercise 2 根据句意, 用所给的词或词组的最恰当形式填空(注意有多余选项)

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lessen,　 dissolve,　 depend on,　 prevent…(from…),　 lay,　 now that,　

on earth,　 on the earth, on time,　 in time,　 surface,　 gradually

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9. The ECP ___________ (出版) weekly.

8. As a parent, you should not ___________(鼓励) bad habits in a child.

7. We must care about further ___________ (进展).

6. It’s a _______ (谜) to me why they didn’t choose him.

5. The news he s__________ around the town was not true.

4. The firework e__________ in his hand.

3. The a___________ over dinner was warm and friendly.