Answer:
In a tunnel of darkness lies a beast of iron. I can only attack when pulled back. What am I?
I can be sweet or sour. I do not rhyme with any other word
What word becomes shorter when you add two letters to it?
I don't have eyes, but once I did see. Once I had thoughts, but now I'm white and empty. What am I?
I love to twist and dance. Though wingless I fly high up into the sky.
No matter how little or how much you use me, you change me every month.