once upon a time. there was a house. beside the house there was a bird cage. one day a cat went to eat the bird， so the cat jumped and hit the bird cage.
the bird cage fell down to the ground knocking the bird cage's door open. the bird then flew away. so the cat started to chase the bird and th[复习必备 | 海量免费学习视频资源尽在“学而思轻课APP”>>>点击了解]e dog chased the cat. however the bird flew on top of the tree. so the cat started to climb the tree and the dog barked at the cat. before the cat could reach the bird， the bird flew away. this caused the cat to fall out of the tree.
the dog then ran away， the bird quickly flew back into his cage and the man from the house carried him safely home.
