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ll keep fit. ? should have a bike light or wear lightcolored clothes. ? roads will be safe. ? must drive on the lefthand side of the road. Bicycles in China Why are the bicycles popular around the world? Because: 1. They don’t cause air pollution. 2. They need less space than cars. 3. They save money and energy. 4. They save more time than walking. 5. Bicycling is good for our health.