You ___________ wear a crash helmet on a motorbike., must, mustn't, You _________ turn the left., must, mustn't, You __________ cross the road when you see the red man at a pedestrian crossing., must, mustn't, You _________ cycle in a cycle lane., must, mustn't, You _________ wait for the green man at a pedestrian crossing., must, mustn't, You __________ enter the street with this sign., must, mustn't

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