Answer:
I always have to work with something in my eye.
I am round as an apple, deep as a cup. All the King's horses can't pull me up. What am I?
I am one small little piece of paper yet sometimes hold lots of value. I am all you need to get in to big events but will cost you. I am an important part of travel. And if lost you're not coming.
As a state in the USA, I am round on both sides and high in the middle. What am I?
I cannot be felt, seen or touched. Yet I can be found in everybody. My existence is always in debate, yet I have my own style of music. What am I?
I will disappear every time you say my name.