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    Mr.Smith looks young,but he is sixty-eight years old.He has some children.One of his sons is a doctor.The other is studying in America.The daughter is working with her father.Now, Mr.Smith works in a factory near here.He thinks Chinese people are friendly and Chinese food is very good.He can speak a little Chinese.So he goes to Chinese classes every day.He says it is hard to learn Chinese.And he must study hard.