Answer:
Always in you, sometimes on you. If I surround you, I can kill you. What am I?
Without me everyone would lose their head.
I am the best thing that can happen after a stick hits a ball.
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 pass before the sun but make no shadow. What am I?
What language does a billboard speak?