Answer:
Open me, and you can't see me without a mirror. Close me and you can't see me at all. What am I?
I'm an animal. I love marching. I always wear a tuxedo. What am I?
I am tomorrow's yesterday and yesterday's tomorrow. What am I?
I stand in one place yet I fill a whole room. I can be filled with molten rock and come in every hue.
I always go to bed with my shoes on. What am I?
Deep, deep, do they go. Spreading out as they go. Never needing any air. They are sometimes as fine as hair.