七年级英语作文：I usually500字

　　It’s our duty to protect our environment. More and more people ride bikes when they go out nowadays. It’s helpful to keep the air clean.
　　I usually ride to school. I only take a bus on a rainy day. On my bicycle I can breathe the fresh air and do some exercise to keep healthy. On the other hand, I can keep away from the traffic jam and make sure I can arrive at school on time. To my joy, I can also do a bit for keep the air clean by riding a bicycle.
　　I hope everybody will join us and take care of our environment in this way. I believe the air around us will be cleaner with the help of us all.