Answer:
I run up and down the stairs without moving. What am I?
What is black when you buy it, red when you use it, and gray when you throw it away?
If you lose me you may cause people around you to lose me too.
I live above a star who never burns. I have 11 neighbors but they never turn. My initials are p q r and sometimes s.
I stay where I am when I go off. What am I?
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.