Answer:
Mouth up it gets filled, mouth down it gets empty.
I'm the start of eternity and the end of space. There are two of me in heaven and one in hell.
Mary's child slept in one of these
I am the red tongue of the earth, that buries cities.
There is a man in a 4 story building. He jumps out of the window and is unharmed. He used no padding, and had no harm done. How?
I am a rock group with four members. All dead one was assassinated.