1. What brings you here today?什么风把你吹来啦?

　　2. Hello, there, what a coincidence!你好，可真巧啊!

　　3. Well, look who's here!嘿，看谁来了!

　　4. It's really nice to see you again.再见到你真好!

　　5. Small world, isn't it?世界真小啊!不是吗?