9. After hard working, they improved the things ______________.

8. The cuckoo(杜鹃) __________ its eggs in other bird’s nest.

7. The old man ____________ his two sons for food and clothing.

6. Salt ____________ easily in water.

5. You must not look only at the __________ of things.

4. Do you best in your career, you’ll succeed ____________.

3. Nothing on earth can _________ me ________ loving her.

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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