Answer:
I am a little piece of paper, yet sometimes hold lots of value. I am all you need to get into big events, but will cost you. I am an important part of travel. And if lost, you're not coming. What am I?
What is always in front of you but can't be seen?
What do you call a sleeping bull?
I am known for my natural tuxedo and marching. What am I?
When it comes to me you go on red and stop on green.
If I say "everything I tell you is a lie", am I telling you the truth or a lie?