请用下列短语填空: what you said how it happened who drove the car that I fell down on the street that I was knocked down by a car A: What’s wrong with your leg? B: Well, I hurt my leg last night. A: What happened? B: I’ve forgotten how it happened. I just remember ____________________ ________________. A: Did you see ____________________? B: No, I didn’t. The car was going too fast and the light was so strong. A: What did you tell your mother? B: I told her ______________________________. A: Do you think that she believed ________________? B: I don’t think so.