Answer:
I need to be taken from you before you can have me.
When you take away the whole from me, there is always some left. What am I?
With a halo of water and a tongue of wood, stone as skin long I stood. What am I?
I stand in one place yet fill the whole room. I can be filled with molten rock and come in every hue. What am I?
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 yours but only used by others?