①You mustn't walk around during landing. A. On a bus
②You mustn't talk to the driver. B. On a train
③You must wear a helmet . C. On a bike
④You must wear a seatbelt. D. On a car
⑤You mustn't put your head out of the window. E. On a plane
⑥You must wear a lifejacket. F. On a boat
school cars easy air exercise use
Many people in the world ride bicycles every day. There are more bicycles than in the world today. A lot of Chinese people ride bicycles to go to work or . Bicycles are much cheaper than cars. And it is for people to learn to ride. Bicycles are also used for . It helps us to keep fit. If each family has a car, it will a lot of energy and pollute the . So let us ride bicycle.