Answer:
I'm not really more than holes tied to more holes; I'm strong as good steel, though not as stiff as a pole.
People need me, yet they give me away every day. What am I?
I go up and down at the same time. Up towards to sky and down towards the ground. What am I?
What side of a cat has the most fur?
What goes up and down but does not move?
No matter how little or how much you use me, you change me every month.