Read and order..看图片按故事发展顺序给下列句子排序。
（_____）The air is cleaner, the clouds are whiter.
(1) I am a bird. I fly in the sky. I like clouds. They are pretty. I live in a tree. The tree is near a river.
（_____） There aren’t any fish in the river. There is only one tree. I feel lonely.
（_____） Then there are more and more trees and flowers. There are many fish in the river.
(4) They grow flowers, too.
（_____） More birds come. I am happy.
（_____） One day, I see some students. They are planting trees.
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