Answer:
I may only be given but never bought. Sinners seek me but saints do not. (one word).
I save lives on the ground and in the air. What am I?
I am easy to see but no one likes looking at me. Without me there would be no you. I can make you complain or make you happy. But you almost always take me for-granted.
What is made of wood, but can't be sawed?
My first is in fish but no in snail. My second is in rabbit but not in tail. My third is in up but not in down. My fourth is in tiara but not in crown. My fifth is in tree you plainly see. My whole a food for you and me.
No matter how little or how much you use me, you change me every month.