People put me on the table and cut me but do not eat me. What am I?

A man in a car saw a Golden Door, Silver Door and a Bronze Door. What door did he open first?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

I look at you, you look at me, I raise my right, you raise your left. What am I?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

Name the three-letter word that can complete the below words?

A) L O _ _ _ E
B) E D U _ _ _ E
C) _ _ _ E R
D) _ _ _ T L E

It belongs to you, but other people use it more than you do. What is it?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?