It's very important for us to keep ourselves safe,especially when we ride a bike .First ,you should learn basic cycling skills - most importantly,know how to stop safely.Secondly,you should check your brakes and tires often.Don't try to do dangerous tricks on your bike.You mustn't give rides to other people.Don't ride on the sidewalk.In this way ,you can ride a bike safely. 再问： 没够八十词啊
