Answer:
I hold two people together but touch only one.
I make things short but I am pretty long myself
Drop me and the world will shatter. You can always find me where you empty your bladder.
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?
I welcome the day with a show of light. I steathily came here in the night. I bathe the earthy stuff at dawn but by noon, I'm gone. What am I?
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.