IQ问题求助(英语不错的请进来）

IQ问题求助(英语不错的请进来）
1、I have a mouth,but I don`t breathe;I have a bank,but no money inside;I have a bed,but I don`t sleep;I always run,but never walk.What am I?
2、What always falls,but never getting hurt?
3、I always teii the truth.I show everything I see.I can be all shapes and sizes.What am I?
4、There is one place that you can sit,but your mom can`t.Where is it?
5、What is black when clean and white when dirty?