The sun is a huge, hot and bright star. It is important because without it there would be no life on the earth. The sun gives us light and heat.
All living things depend on the sun for their growth. Plants need light and heat to grow. They use the light from the sun to make food. But we human beings cannot make food by our own bodies from the sun. All the food we eat comes from plants in a food chain(链) . And the food chain starts with the sun . For example.
sun —→ potatoes  —→ chips
sun  —→ corn  —→ hens  —→ eggs
sun—→ wheat  —→ bread
     Animals need sunlight, too. Just like us, their food comes from plants in food chain, which begins with the sun. For example,
Sun → leaf → caterpilllar(毛虫) → bird
Sun → seaweed(海藻) → small fish → whale(鲸)
     With the help of sunlight, we can see things during the day. Even when the sky is cloudy, the sunlight is very strong and it shines through the clouds. If there was no sun, it would be dark all the time.

    When you look at the sky at night, the Moon looks bigger than the stars. Actually (实际上), the Moon is much smaller than the stars and the Sun. It's much smaller than the Earth. But the Moon is much closer to us than any star. That is why it looks so big. If you hold a coin close to your eyes, it looks big. If you look at it across the Moon, it looks small.

    The Moon moves around the Earth. It makes one trip in about four weeks. The Moon looks flat to us. But it is a round ball, like the Earth.

    People once thought the Moon had fire (火) on it. They thought the fire made it bright. Now we know the Moon is like a mirror. It gets its light from the Sun.

    Our sunlight comes from the Sun, too. What is the Sun? The Sun is a star. The stars we can see have their own light. There are many big stars we cannot see. Their light has burned out. Others are still bright, but they are so far away that we cannot see them. The Sun looks bigger and much brighter than other stars in Galaxy because it is the nearest of all stars. The Sun and the other stars we see are very hot, but the air around us saves us from the heat of the Sun.

    The Sun gives us light and warmth (温暖). It makes plants grow and turns leaves green. It makes life possible on the Earth. It is a life giving star.

No one can be happy all the time. You may become unhappy sometimes. Do you know what to do with that? Maybe you can do the following things. They can help you become happy again.

Teachers help us to be good students and people. So we should thank them for their work. In China, we have Teachers' Day on September 10th. On that day, we say thanks to our teachers. But how do students in the US thank their teachers?

Schools in the US have a whole week in May to appreciate their teachers! Teacher Appreciate Day is on Tuesday of that week. They have parties with gifts and snacks that week. Students in the US like to give small gifts to their teachers, and the teachers love getting thank-you notes from their students. Teachers also like getting trinkets from students.

Should we say thanks to our teachers only on Teachers' Day? No. We should thank our teachers all the time. Always show our love to our teachers. It helps them do a good job.

Museums are active centers of learning. In a science museum, people can learn about nature and technology as well as physics and chemistry. Visiting museums is a good choice to spend a holiday for people of all ages. But there're some rules when visiting museums. Take an art museum, for example.

Keep quiet. You can talk, but keep the voice down and be polite to those around you. You should turn off your phone or put it on silent. Sounds from your phone may disturb (打扰) others. If a call must be made, you should go outside to make it. 

Ask before taking photos. Some museums welcome visitors to photograph or videotape works of art. However, please be careful with the sign "no photography" which means taking photos is not allowed for that work or exhibition. If you take photos without permission, you will be in trouble. Maybe you will be punished. 

Do not touch works of art! Your touch may not seem like much, but even the slightest (最轻的) touch can damage the surface of a painting, discolor stone, and even rust metal. Keep a safe distance between you and each work of art. This helps to avoid accidental touching.

Never bring food or drinks into the museum. It's no good eating or drinking there. The art in the museum will provide plenty of food for thought as well as a dinner for the eyes!

Running and pushing are not allowed in the museum. Proper museum behavior is necessary to avoid accidentally hitting or damaging works of art.

Remember: ____. If you obey them, you will surely enjoy yourself in the museum.

There is a nature park in the southwest of our city. The government built it for the rare (稀有的) animals {#blank#}1{#/blank#}(live). The nature park is the symbol of our city. 

Yesterday, my friends and I got up early {#blank#}2{#/blank#}(visit) it. We saw many different{#blank#}3{#/blank#}(kind) of animals, such as tigers, bears and giraffes. The giraffes have{#blank#}4{#/blank#}(long) necks of all the animals in the world. The workers there asked us {#blank#}5{#/blank#}(not feed) the animals. Many animals are in danger {#blank#}6{#/blank#} people kill them for their meat and fur (皮毛). What's more, people are taking away their land and making their water {#blank#}7{#/blank#}(become) dirty. The situation is becoming worse and worse. 

We had {#blank#}8{#/blank#} meaningful day yesterday. Above all, I learnt so much. I think people should set up more comfortable houses for the animals and help them {#blank#}9{#/blank#}(live) in peace. We should do our best to protect them because {#blank#}10{#/blank#}(protect) them is protecting ourselves. We should take action now!