Answer:
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.
I am a band that does not perform sing or act.
What can travel all around the world without leaving its corner?
My snake-like body cracks and burns. I cause pain but pleasure too. What am I?
What is an astronaut’s favorite key on a keyboard?
I flow from the Homer’s mouth when he sees doughnuts.