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    Tom and his father are playing in the playground. There is a cat and a dog there.  They are playing with a ball together. “I think the cat is older than the dog," Tom says, “I don't think so," his father says. “Why?"  “Because the dog looks bigger than the cat " Tom laughs and says, "But I like the cat.  It is white and it is funnier than the dog. " Tom's father says, “Dogs are my favourite animals because they are very friendly to me " "Yes, but I like smaller ones. Can we keep one?" Tom says. "of course," Tom's father says.