Answer:
I always murmur but never talk. Always run but never walk. I have a bed but never sleep, have a mouth but never speak. What am I?
You see a boat filled with people. It has not sunk but when you look again you don't see a single person on the boat. Why?
I'm at the head of an elephant and at the tail of a squirrel
I am whole but incomplete. I have no eyes yet I see. You can see and see right through me. My largest part is one fourth of what I once was.
With a halo of water and a tongue of wood, stone as skin long I stood. What am I?
No matter how little or how much you use me, you change me every month.