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.
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