it,they,them,this,what,that 

   In the United States,Christmas is celebrated through the country. Many people,regardless of their religion,put up and decorate a Christmas tree. The tree can be a real evergreen or 1. can be an artificial tree. Lights,strings and even popcorn can be used to decorate a Christmas tree. On the top of the tree is a star or an angel. The decorations are usually red and green.

   The purpose of a Christmas tree is to have a central location to place gifts. According to legend,Santa Claus leaves presents under the tree. Children in the US often write lists of things 2. want Santa to bring them. Many parents bring their children to shopping malls across the country to tell a man dressed as Santa 3. they want. On Christmas Eve many children leave milk and cookies for Santa. Of course it is the parents 4. buy the gifts from the wish lists and even eat the cookies and drink the milk.

   On Christmas Day children usually wake up early and run to the tree so they can see what Santa brought 5. . Adults can also exchange gifts at 6. time.

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6. Someone must have been there. But we have no idea (是谁) .

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5. —I'm thinking of the driving test tomorrow. I'm afraid I’11 fail again.

—Cheer up. I'm sure   (你会成功) .

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4. Susana's aim is to tell all citizens they have a duty to protect the environment, (对吗) ？

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3. —  (要紧吗) if I can't finish the job on time?

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2. —Steven's parents have bought him a computer.

—     (难怪) that he looks so happy.

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1.    (我将不胜感激) if you would open the window; it's too hot.

14. (It,This) is not how much you read but what you read that counts.

13. 1 don't think (him,it) possible to finish the hard work in such a short time.

12. —Who is making so much noise? ’

— (There are,It is) a couple who are quarrelling.