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A. people on bikes must wear one.
B. I often come to school by bike.
C. How do you come to school?
D. pay attention to the traffic lights!
E. Don't go at the red light!
Mike:
Amy: I usually come to school on foot. What about you?
Amy: What's this? A helmet?
Mike: Yes, In the USA
Amy: I see. Do you know some traffic rules?
Mike: Of course.
Amy: Great! We must
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