1)A: Jack's a good mountain climber.B: What's the highest mountain he's ever climbed?2) A: We've seen some very strange animals. B: What's the strangest animal you've ever seen?3)A: I love travelling.B: What's the best place you have ever visited?4)A: I've made a lot of mistakes.B: What's the worst mistake you have ever made?5)A: My two brothers love dangerous sports.B: What's the most dangerous thing they have ever done?6)A: She sometimes does really silly things.B: What's the craziest thing she has ever done?