I found ___________ difficult to make sounds like birds.

A. that B. that it is

C. it D. it is

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This kind of machine ______ cutting meat in big restaurants.

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Even if you are a good high-jumper, you can jump only about seven feet off the ground. You cannot jump any higher because the earth pulls you hard. The pull of the earth is called gravity.

You can easily find out the pull of the earth. If you weigh yourself, you will know how much gravity is pulling you.

Since there is gravity, water runs down hill. When you throw a ball into the air, it falls back down. Because of gravity, you do not fall off the earth as it whirls (旋轉(zhuǎn)) around.

Then, can we get away from the earth and go far out into space? Now you can do it, because spaceships have been invented. Then spaceship will go so fast that it can escape (逃出) the earth’s gravity and carry you into space.

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A. the pull of everything.

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D. the force which attracts the earth towards the sun.

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Scientists are trying to make the deserts （沙漠）into good land again. They want to bring water to the deserts, so people can live and grow food. They are learning a lot about the deserts. But more and more of the earth is becoming deserts all the time. Scientists may not be able to change the deserts. Scientists think that people make deserts. People are doing bad things to the earth.

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Hi, my name’s Alan. I’m fourteen years old. I go to Canyon Middle School in America. I go to school on weekdays, but not on Saturday or Sunday. I usually have breakfast at eight o’clock. I enjoy some bread and milk for breakfast. My class starts at ten to nine. My friend Lisa sits in front of me, and my friend Peter sits next to me. We have three lessons in the morning, and we usually have English, maths in the morning. In the afternoon, we usually have a PE lesson and we often play basketball. That’s my favourite. I don’t like history or geography because they are difficult. After school, I usually go back home at once. In the evening, I enjoy watching TV.

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C. Because it’s hard.

D. Because it’s not funny.

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B. Lisa, Peter and Alan are studying in the same class.

C. Alan likes art best, but he doesn’t like history.

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