Answer:
At night I come without being fetched, and by day I am lost without being stolen. What am I?
Two bodies have I, though both joined in one. The more I stand still the faster I run. What am I?
I am a precious stone, as clear as a diamond. Though you can walk on water with my power, try to keep me, and I'll vanish in an hour. What am I?
After you go through a fall, I will take over. All life will stall, or at least grow slower. What am I?
I am tomorrow's yesterday and yesterday's tomorrow. What am I?
It has no top or bottom, but it can hold flesh, bones, and blood all at the same time.