从方框中选择合适的选项补全下列对话。

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?

Mike:

Amy: What's this? A helmet?

Mike: Yes, In the USA

Amy: I see. Do you know any traffic rules?

Mike: Of course.

Amy: Great! We must