Mike is twenty-five years old. He is a b man, so it is not easy for him to get around by himself. But he has a guide dog. He is called Robert and he is very i to Mike. Mike thinks Robert is his "eyes". Robert always lMike to different places by pulling the rope（绳）in Mike's hand. When they a at a place, Robert lets Mike know by b at him. Most of the time Robert just sits next to Mike and waits for him to finish his business.
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