阅读下面对话，并选择括号内所给的单词填空，使对话意思完整

(hit, hear, happening, stopping, badly, fast, hurt, while, bike, took, it, asked)

　　A: Look! A lot of people are standing round the truck. What is ________ (1)?

　　B: Maybe it's an accident. Is anybody ________ (2)?

　　C: Yes. A man on the ________ (3) was traveling too fast ________ (4) the truck was ________ (5) at the corner. The bike ________ (6) the truck.

　　A: Did the man get ________ (7) hurt?

　　C: Yes. He couldn't get up, and a police car came and ________ (8) him to a hospital.

　　B: Oh, poor man! I'm very sorry to ________ (9) that.

　　A: So it's dangerous to travel too ________ (10) in the street.

　　C: Yes. We must be careful.