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Uncle Wang works in a bookshop in the middle of the city. The shop is not far from his home. It is about one kilometre away. So Uncle Wang seldom (很少) goes to work by bus. He usually goes there by bike, sometimes on foot. It takes him twenty minutes to get there by bike and forty minutes on foot. Today his bike is broken. He wants to walk there. He leaves home at ten to eight, twenty minutes earlier than before. His work starts at half past eight in the morning and finishes at five in the afternoon.