Answer:
In a tunnel of darkness lies a beast or iron. It can only attack when pulled back. What is it?
I am an instrument that you can hear but cannot see or touch. What am I?
What asks but never answers?
I am bought by the yard but worn by the foot
The sun bakes me, the hand breaks me, the foot treads on me, and the mouth tastes me. What am I?
No matter how little or how much you use me, you change me every month.