Answer:
I run up and down the stairs without moving. What am I?
What gets sharper the more you use it?
I am used when you jump off a bridge for fun.
Part carbon part water I am poison to the fishes. Many falsely claim my name I am the pause that refreshes.
Every night I'm told what to do and each morning I do what I'm told. But I still don't escape your scold
A little house full of meat, no door to go in and eat.