13． 　　Four students are talking about the best museums they have ever been to.

14．Finding the Owner
　　"It's mine," said Fred, showing a pocket knife with a shining blade (刀片). "Just what I've always wanted." And he turned it over and over with the look of satisfaction on his face.
　　"I guess I know who owns it," said Tom, looking at it carefully.
　　"I guess you don't. It isn't Mr. Raymond's," Fred replied quickly.
　　"I know. Mr. Raymond's is twice as large," said Tom, going on with his drawing.
　　Tom's doubt was taking away Fred's enjoyment. In fact, Fred was not comfortable with the knife at all, for he felt that he was having something that did not belong to him and he got worried. He even had serious thoughts of burning it, or hiding it, or giving it away; but a better plan hit him.
　　"Tom," said Fred, one day at break, "didn't you say that you knew who owned the knife?" "Yes, I did. It looked like Doctor Perry's," Tom ran off to play with others, without giving the knife another thought.
　　It was Dr. Perry's! Fred looked at his watch and realized he only had a little time, so he started quickly, and found the old gentleman getting ready to visit a patient. "Is this yours?" cried Fred, in breathless haste, holding up the cause of a week's anxiety.
　　"It was," said the doctor, "but I lost it the other day."
　　"I found it," said Fred, "and have felt like a thief ever since. Here, take it. I've got to run."
　　"Hold on!" said the doctor. "I've got a new one, and you are quite welcome to this."
　　"Am I? May I? Oh! Thank you! Now, I'm the real owner of the knife. What a different feeling!"

15．　　My children (1)             (grow up) fast. My daughter is 16 and my boy is already in junior high school. As they get bigger, our house seems to get smaller. So we want to sell some of our things in a yard sale and give the money to a (2)             (children) home.
　　We have already cleared out a lot of things from our bedrooms. We have decided to each sell five things that we no longer use. My son was quite sad at first although he (3)             (not play) with his old toys for a long time, he still wanted to keep them. For example, he has owned a train and railway set since his fourth birthday, and he played with it almost every week until he was about seven. And he didn't want to lose his toy monkey, either. He slept next to the monkey every night when he was a child. My daughter was more understanding although she also (4)             (feel) sad to part with certain toys.
　　As for me, I didn't want to give up my football shirts, but, to be honest, I have not played for a while now... I am getting (5)             (old), too!

16．
When I first arrived on this island, I had (1)            . But I've found the ship and made a small boat. I've brought back many things I can use—food and drink, tools, knives and guns. (2)             I have lost everything, I have not lost my (3)            . So I will not give up and I will wait for another ship. I have already cut down trees and built a house. I go out with my gun almost every day to kill animals and birds for (4)            . I'm even learning to grow fruit and vegetables.
A few weeks ago, I found the (5)             of another man's feet on the sand. Who else is on my (6)            ? How long have they been here? Not long after that, I (7)             some cannibals trying to kill two men from a broken ship. One of them died but the other ran towards my house. I helped him kill the cannibals. This man now lives with me and helps me. I named him Friday because that was the day I met him. He is smart and I have already (8)             him some English.

21．请根据以下三点提示，介绍你最喜欢的物品，短文不少于100词。
1. In the first paragraph, introduce your favorite thing.
2. In the second paragraph, talk about why it is special.
3. In the third paragraph, write about a story or memories about it.
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