A: Whoa, whoa, what's going on? Watch out!
B: Hey! Watch where you are going!
A: Oh, no. I'm so sorry. Are you all right?
B: Oh, I don't know.
A: I feel terrible, I really didn't mean to knock you over. My tire just exploded, and I lost control of my bike. Really it was an accident, please accept my apologies.
B: Just let me try to stand up. Oh, wait a second, you seem really familiar. I think I know you from somewhere.
A: Yeah, that's right. I think we've met somewhere before. We met at Aaron's place last weekend. What a coincidence, but anyway I'm glad to see that you're not too badly hurt, and I should probably get going. I have a nine-o'clock meeting but here's my number. Call me and we'll exchange insurance information.
B: Ouch! My ankle! I think it's broken! You can't just leave me like this. Are you calling an ambulance?
A: Nope. I'm cancelling my appointment so that I can stay here with you.
1.knock over/down撞倒。例句：I knocked over my coffee cup all over my desk this morning.今天早上，我把桌子上的咖啡打翻了。She was knocked down by a bus.她被一辆公共汽车撞倒了。
2.control控制；gain/take/lose control of...获得/接管/失去对...的控制；beyond control超出控制；under control在控制下
3.familiar熟悉的；look/sound/taste familiar看/听/尝起来熟悉。例句：You look really familiar. Do we live in the same neighborhood?你看起来真的很眼熟。我们是不是住一个街坊？be familiar with...通晓；熟悉。例句：I'm familiar with this neighborhood.=I know this neighborhood very well.我对这附近很熟悉。
4.cancel取消；例句：All fights have been cancelled because of the bad weather.由于恶劣天气，所以航班都被取消了。The train to London has been cancelled.去往伦敦的火车被取消了。