Answer:
I go inside boots and outside shoes. What am I?
I don't have eyes, but once I did see. Once I had thoughts, but now I'm white and empty. What am I?
As a stone inside a tree, I’ll help your words outlive thee. But if you push me as I stand, the more I move the less I am.
I go up and down at the same time. Up towards to sky and down towards the ground. What am I?
It flies around all day but never goes anywhere? What is it?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.