A. pedal    B. tire   C. helmet    D. seat    E. pump 

F. brakes    G. handlebars

A. No smoking     B. Don't walk on the grass    C. Stop         D. Go          

E. No talking     F. Smile        G .Don’t touch

① ②   ③ ④

⑤ ⑥ ⑦

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