把下列词组的序号填入相应的位置。
A.On a bus …
B.On a train …
C.On a bike …
D.On a car …
E.On a plane …
F.On a boat…
(____) 1.You mustn’t walk around during landing.
(____) 2. You mustn’t talk to the driver.
(____) 3. You must wear a helmet.
(____) 4. You must wear a seatbelt.
(____) 5. You mustn’t put your head out of the window.
(____) 6. You must wear a lifejacket.