People all over the world like taking part in sports. Bicycle riding becomes more and more popular. It's1to ride a bicycle. The old people, the young people, the teenagers, all have 2own bicycles. Every day, we can3people riding their bicycles to workplaces, to schools, to shopping centers, and so on. There are many kinds of4. For example, racing bikes are easy to go5, and mountain bikes are durable（耐用的）for6roads.
Riding a bike is7in many ways. First, it doesn't make much8or cause（引起）air pollution. Second, riding a bike is a kind of good9. It can help you keep10.
Third, people don't need to pay for gas（汽油）or worry about heavy11.
Now more and more12ride bicycles. Why not13computer games and go bike riding14weekends? You will have a good time riding a bicycle with friends and become much15.
