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　　Mike is seven and begins to go to school this week．It's Sunday today．His mother Mrs Smith doesn't go to work．Mike wants to go to the zoo．He gets up at six thirty and asks his mother to take him there．After breakfast they go to the bus stop．They want to take a No．Three bus to the zoo．

　　“Look, Mummy!”the boy is calling out．“A No．Three bus is coming!”

　　“No, dear,”Mrs Smith is saying．“It isn't No．Three．It's No．Twenty-one．”

　　Your re wrong, Mummy, Mike is saying．My teacher says two and one is three!”