Uncle Wang works in a book shop in the middle of the city. The shop is not far from his home. It is about one kilometer away. So Uncle Wang seldom goes to work by bus. He usually goes bike 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. Now he is having breakfast. He leaves home at 7:50 and he walks to work twenty minutes earlier. His work starts at 8:30 in the morning and finishes at 4:45 in the afternoon. Why does he seldom   go to work by bus? Because    _   .
there is no bus his shop is not far from his home he likes riding a bike his shop isn't in the middle of the city