1. After her opponent had spent several weeks slandering her, the candidate decided to fight fire with fire.2. When evangelists come to our house and try to convert us, my mother would do the same thing to them and try to convert them to her religion.
 do the same thing to somebody fight fire with firefight fire with fire 的意思是 "以其人之道還之其人之身"。
My boyfriend keeps pushing me to marry him, and I keep ptting him off because I am not sure if he's right for me.