Earth is our home. It has air that we can breathe(呼吸). It has water for us to drink. It has plants and animals that we can eat. Earth is not too hot or too cold for us. It has everything we need to live.

    We are on earth, but we call see things that are not on earth. Early in the morning, we can see the sun comes up. All day, the sun seems to move across the sky. Later in the day, we can see the sun goes down. But the sun is not really moving around us. We are the ones who are moving. Every morning, we turn towards the sun. Every night, we turn away from it. Every year, we go around it. Earth is our spaceship. All of us in the spaceship are riding around the sun.

    At night, we can often see the moon and stars. From earth stars look like little points of light because they are so far away. But stars are really big. A star is a great mass of burning gas. It gives off light and heat. Our sun is a star.

    There are eight planets moving around our sun. Earth is the third planet around the sun. Some of the planets have moons. A moon goes around a planet just as a planet goes around a star. Earth has only one moon. Some planets have more.

① {#blank#}1{#/blank#} Tom is looking for his schoolbag. He wants to do his homework.

② {#blank#}2{#/blank#} Mike can't find the model plane. He is worried.

③ {#blank#}3{#/blank#} Linda lost her ID card. She is asking her friends about it.

④ {#blank#}4{#/blank#} An English book is in the teacher's office. Is it yours?

⑤ {#blank#}5{#/blank#} Some keys are in the computer room. Call Mary if you lost keys.

    Today is Saturday．It's also the Teachers' Day, Lily and Tom's mother's festival．They get up early in the morning and want to help their mother do the housework．They first clean the room and then wash the clothes．And then they make breakfast for their mother Lisa．

    It takes Lily and Tom a long time to make the breakfast．They make a chicken hamburger and some salad．These are Lisa's favourite food．They also prepare(准备) a glass of milk．They think it's healthy for their mother．Then they go to their parents' room with the food and drink.

    Dad sits on the sofa and reads a newspaper to Lisa．There is much interesting news(新闻) in it．Lisa also thinks it is fun．They seem very happy．“Good morning, Mum and Dad,” say Lily and Tom．Then they walk to their mother and say: “Mum, Happy Teachers' Day!”

Lisa looks at the children and the breakfast．“Thank you so much!” Lisa feels very warm now.

    More and more people like bicycling and it is no surprise. It is fun, healthy and good for the environment. Maybe that's why there are 1.4 billion bicycles and only 400 million cars on roads worldwide today. Bikes can take you almost anywhere, and there is no oil cost!

    Get on a bicycle and ride around your neighbourhood. You may discover something new all around you. Stopping and getting off a bike is easier than stopping and getting out of your car. You can bike to work and benefit(受益）from the enjoyable exercise without polluting the environment. You don't even have to ride all the way.

    Folding(折叠）bikes work well for people who ride the train. Just fold the bike and take it with you. You can do the same on an airplane. A folding bike can be packed in a suitcase. You can take a common bike with you when you fly, too. But be sure to look for information by getting on airline websites. Not all airlines are bicycle-friendly to travelers.

    Health benefit of Bicycling:

    ⒈It helps to prevent heart diseases.

    ⒉Bicycling helps to control your weight.

    ⒊A15-minute bike ride to and from work three times a week burns off five kilos of fat in a year.

    ⒋Bicycling can improve(改善）your mood. Exercises like bicycling has been shown to make people feel better, more relaxed and self-confident.

    ⒌Bicycling is healthier than driving.