Most people go to school or go to work by car or by bus. They think it's convenient . But I usually ride a bike to go to school. Here are some reasons : It's healthy. Riding a bike is good exercise for us. It makes us feel good. It's green. Riding a bike is green. It causes  very _ , so if more people ride bikes, the open air will be cleaner. It's cheap. After spending  60 yuan on an old bike, you can ride and go to interesting places. It's interesting. It's very interesting to ride a bike if you want to have a trip  with friends. You can stop if you like to see the beautiful things. You can also talk and sing happily and feel relaxed . There are   _  reasons for the writer riding a bike.
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