听短文，选择。
（1）_________________ at a red light.
A. Let’s go B. Stop and wait C. Slow down and stop
（2）How does John come to school?
A. By bus. B. By bike. C. On foot.
（3）We _________ pay attention to the traffic lights.
A. shouldn’t B. must C. must not
（4）---Does Amy often come to school by bike?
---_______
A. Yes, she does. B. No, she doesn’t. C. Yes, she is.
