It is March 12th. It's Tree Planting Day. There are many people on the hills. They're planting trees. People plant many trees today. Plants are important to us. They can make food from the air, water and sunlight. But animals and people can't do so. Animals and people can get food from plants. Without plants, life will not go on, Plants make the air clean. They can keep water from flowing away(流失). They can stop wind from blowing up sand and earth. But in some places people are cutting down too many trees. This brings about floods and sandstorm. Now more and more people know that plants are important. They will plant more trees and grow more plants. They will try to protect the trees.

    It's Sunday. It's a fine day. Sarah and her friends are in the playground. They are playing football. Oh, it's six o'clock. Mike feels hungry and thirsty. Sarah feels tired and sleepy. Sam feels hungry and tired. Where is Helen? She is over there. She feels bored and thirsty. Mike gives her a story book and a bottle of water.

Yang Ling: Excuse me, what's that on the table?

Nancy: It's a toy car.

Yang Ling: Oh, how nice! Can I have a look?

Nancy: Sure. Here you are.

Yang Ling: Thank you. I like it very much. Is this your toy car?

Nancy: Yes, it is.

    Isaac Newton was a famous scientist. He was born in England in 1642. When he was a child, he was very quiet. He was always thinking about things. One day he was reading a book under an apple tree. He saw an apple fall from the tree. He thought, "Why do apples fall? What makes them fall?" He was the first person to find out why.

    How time flies! It's time to say goodbye!

    Thank you, my dear friends. We really changed a lot in six years. Before, we were short and small. Now, we are tall and big. We studied and played together. We learned about robots in the science club. We had lots of fun.

    Thank you, my friendly teachers. Sometimes you were strict, but our classes were full of fun. We had different parties in spring. We visited the Great Wall and the nature park in autumn. They were all interesting.

    Thank you, my lovely school. We learned and enjoyed every day. We painted in the art room. We read books in the library. We jumped and ran on the playground. It was happy to study here.

    In the past six years, we had so many special memories (回忆).