Answer:
I don't live within a house, nor do I live without. Most will use me when they come in, and again when they go out. What am I?
With three eyes and as black as night I frequently knock down ten men with a single strike!
I march before armies, a thousand salute me. My fall can bring victory, but no one would shoot me. What am I?
Lovely and round, I shine with pale light. Grown in the darkness, a lady's delight. What am I?
I can run but not walk. Wherever I go, thought follows close behind. What am I?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.