A: Hi, Bill. You were not at school yesterday. 1. ________ B: Oh, I fell off my bike on my way to school and hurt my leg. A: I'm sorry to hear that. 2. ________ B: No, my father took me to the hospital. 3. ________ A: We should be more careful when we ride. In fact, we should never ride too fast. B: You are right. 4. _________ If we break the rules, we may be in danger. A: Let's go to the traffic station to learn more rules. B: 5. _________