For centuries, people wondered how big the Earth was. Unfortunately, although the Earth was flat, no one was able to figure out its size. Gradually, however, people began to realize that the Earth was really round.

Then, in the third century BC (2, 300 years ago), a Greek man named Eratosthenes had an idea. Eratosthenes was sure that the Earth was a sphere. He used the sun and geometry(几何学) to figure out the size of the Earth. He calculated that the circumference(圆周) of the Earth was 28, 600 miles(46, 000 kilometers).The true size of the Earth is 25, 000 miles (40, 000 kilometers).

Eratosthenes' measurement was wrong, but it was very close to the truth.

For many centuries after Eratosthenes lived, people made maps of the Earth. However, they did not know very much about the world outside of Europe, Asia, and North Africa. Mapmakers could not draw accurate maps of the Earth until people began traveling around the world in the fifteenth century, mapping small areas each time. In the eighteenth and nineteenth centuries, people began making correct maps of countries, but the first accurate maps of the world were not made until the 1890s.

Maps today are reliable, inexpensive, and easy to understand. People depend on maps every day. What would our lives be like without them?

The Fitting­in of Suzy Khan

The first time I saw Suzy Khan, I knew I had to help her. She was really small for her age of 12. The boys in my class often 1 about her and laughed their heads off. She would open a book, pretending to read, with tears dropping on the open page.

All I knew was that she was an orphan from Africa. She had just been adopted by a family in town who 2 that the best way for her to learn American ways of life was to be with American kids. I looked down at this 3 girl and promised myself that somehow I would help her.

But how could I help her 4 in with us? There had to be a5.

One day, when I went into the classroom, I saw that Suzy had 6 her geography book to a picture of a train, and in her notebook, she had made a(n)  7 copy.

I was surprised and thought that she could do something in the coming 8 show. So, I took her to see the art teacher, Miss Parker, and showed her what Suzy had 9."Why, it's wonderful," said Miss Parker, who then showed us a poster she had painted 10 the talent show." I need more of these, but I just don't have enough 11. Could you help me, Suzy？"

On the day of the talent show, Suzy's 12 were everywhere—all over the hall and all over the school, each one different.

"And finally," said Mr Brown, the schoolmaster, at the end of the show, "we have a (n) 13 award. I'm sure you've all noticed the wonderful posters." Everyone nodded." One of our own students 14 them."

I could hear everyone whispering." Who in our school could draw 15 well？"

Mr. Brown waited a while before saying, "16 this student worked so hard on the posters, she deserves a 17, too. Our mystery artist is our new student—Suzy Khan!"

Mr. Brown thanked her for all the wonderful posters and gave her a professional artist's set." Thank you, "she cried.

I 18, at that time when I was looking at her excited face, she'd probably never 19 anything in her whole life.

Everyone started to 20their hands. Suzy Khan gave them a shy smile and the applause was deafening. I knew then Suzy was going to be all right.

1）很高兴他能接受邀请

2）确定讲座时间;

3）询问需求。

注意：1）词数100左右(开头和结尾已给出，不计入总词数)

2）可适当增加细节，以使行文连贯

Dear Mr Bruce,

……

Yours,

Li Hua