More and more people 1 bicycling and it is no surprise. It is fun, 2 and good for the environment. 3 that's why 4 are1.4 billion bicycles and only 400 million cars in the whole world today. Bikes can 5 you almost anywhere. Bicycling helps to prevent heart diseases. It also helps to control your weight. A 15-minute bike ride to and 6 work three times a week burns off five kilos of fat in a year. You don't even have to 7 all the way. Folding (折叠) bikes work well for people who 8 the train. Bicycling can improve your mood. Exercise like bicycling has been shown to make people feel 9 , relaxed and self-confident(自信). Bicycling is healthier than 10 .