Answer:
When you stop and look, you can always see me. If you try to touch, you cannot feel me. I cannot move, but as you near me, I will move away from you. What am I?
I am the building with the most number of stories.
I break down buildings, I crumble mountains but you can't see me. What am I?
I run up and down the stairs without moving. What am I?
What is made of wood, but can't be sawed?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.