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完形填空

　　I will never forget an accident that happened in my own childhood.When I was a boy of twelve. something happened to me that made me never 1 　 any birds in a cage.

　　We lived on the edge of a 2 　 in South Carolina，and every evening many mockingbirds would come and rest in the trees and sing.There isn't any sound that can be 3 　 than the song of the mockingbird.

　　I decided to catch a young bird and keep it in a cage，4 　 in that way，I could have my own musician.I finally caught one and put it in a cage.The bird was 5 　 and fluttered about the cage，but finally it became quiet in its new home.I felt pleased with 6 　 and looked after my little musician carefully.

　　On the second day，the bird's mother flew to the cage 7 　 food in her mouth.The baby bird ate up 8 　 she brought.I was pleased to see this.Certainly his mother knew better than I how to feed her baby.The following morning when I went to see 9 　 my little bird was，I found it on the floor of the cage，dead.I was very surprised!What had happened!I had taken great 10 　 of the little bird，or so I thought.

　　Arthur Wayne，a famous scientist，happened to be in the forest where we lived at the time.Hearing me crying over the 11 　 of my bird，he told me what 12 ndline.A mother mockingbird，finding her young in a cage，will sometimes bring it poison food.She thinks 13 　 better for her young to die than to live in a cage.

　　14 　 I never catch any birds to put them in the cage.All the birds have the right to 15 　 in the sky.

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