One possible version: Public bike-sharing, a convenient and cheap form of transportation, has become popular in China as it used to be, but there are also some problems. To solve these problems, users should follow the rules. There are many advantages of public bike-sharing. Using shared bikes can make users live a healthy life because riding bikes makes them stronger. It also helps protect the environment with no pollution caused. In addition, the roads will become less crowded with fewer cars running around. Now that shared bikes are a convenient way for users to get around, users should follow the rules to make sure that they will bring more people greater advantages. For example, users should leave the bikes in proper locations where it is convenient for others to use. What’s more, users who behave badly such as those who damage the bikes should be punished. Those who regularly break the rules should be forbidden to use shared bikes again. One possible version: Public bike-sharing, a convenient and cheap form of transportation, has become popular in China as it used to be, but there are also some problems. To solve these problems, users should follow the rules. There are many advantages of public bike-sharing. Using shared bikes can make users live a healthy life because riding bikes makes them stronger. It also helps protect the environment with no pollution caused. In addition, the roads will become less crowded with fewer cars running around. Now that shared bikes are a convenient way for users to get around, users should follow the rules to make sure that they will bring more people greater advantages. For example, users should leave the bikes in proper locations where it is convenient for others to use. What’s more, users who behave badly such as those who damage the bikes should be punished. Those who regularly break the rules should be forbidden to use shared bikes again. 本文来源：https://www.wddqw.com/doc/c6f7ba3a05a1b0717fd5360cba1aa81144318fb1.html