Skyscrapers are very tall buildings in a city.  Looking up at them might make you dizzy (眩晕的). {#blank#}1{#/blank#} Skyscrapers are a .wonder, whether (不管) you are looking up or down.

    How can the buildings be so tall? Something that happened during the 1880s made it possible. {#blank#}2{#/blank#} First, a man named William Jenney got the idea of using a steel frame to hold up the walls and floors (钢架支撑墙壁和地面) of a building Jenney s idea made it possible to build taller buildings so he is called the "Father of the American skyscraper" Second, the elevators （电梯）improved. {#blank#}3{#/blank#}That helped people go up and down the tall buildings more easily."

    Back in the 1880s, Jenney s first tall building was 10 stories (楼层) high. {#blank#}4{#/blank#}In 2004, Taipei 101, at 101 stories high, became the tallest building in the world. But soon the Burj Khalifa in Dubai overtook it in 2010. The 828-meter building has 163 stories.

    {#blank#}5{#/blank#} For example, Shanghai Tower in China, One World Trade Center in the USA, Abraj Ai-Bait Clock Tower in Saudi Arabia, etc. All of them are really wonderful, aren't they?

根据材料内容，从方框中选择合适的句子填入文中空缺处，使材料完整、通顺。

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    I had a summer camp with my classmates last year. Early in the morning, we gathered at the bus station. After saying goodbye to our parents, we got on the buses. It took us more than two hours to arrive at the camp ground.

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    We got off the buses cheerfully. Laughing and shouting, we jumped and ran all over the place. It was the first time for us to be away from the parents. Some of us started to feel homesick. However, when the night party and dances began, the homesickness（想家）was gone.

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    The next day, everybody rushed to the boating class, hoping to be at the head of the others. At first, my friends and I worked hard, but the boat wouldn't listen to us and kept going round and round. Then the teacher taught us how to work together. After many tries, we did much better.

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    Swimming class was my favorite. It was about the hottest time of a day and the best time to stay in the cool water. The swimming teacher was a funny man, and during the class he often made us laugh happily.

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    During the week I learned a lot of new things and made many new friends. I also learned how to take care of myself.

    Here is a picture of my birthday party. My friends and I are all very happy at the party. Peter is eating the birthday cake. My mother makes it for us and it's delicious. My sister Molly is singing And Selina is playing the guitar for her. Selina's father is a music teacher and he teaches Selina to play the guitar. Dave is talking about basketball with my brother. Where am I? I'm in front of Dave.

    When I first arrived on this island, I had nothing. 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. Although I have lost everything, I have not lost my life. 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 food. I'm even learning to grow fruit and vegetables.

    A few weeks ago, I found the marks of another man's feet on the sand. Who else is on my island? Not long after that, I saw 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 day was the day I met him. He is smart and I have already taught him some English.

—Taken from Robinson Crusoe

    Answer the following questions with No More Than Seven Words.