Answer:
My first is in blood and also in battle. My second is in acorn, oak, and apple. My third and fourth are both the same. In the center of sorrow and twice in refrain. My fifth starts eternity ending here. My last is the first of last, Oh Dear.
A house with two occupants, sometimes one, rarely three. Break the walls, eat the boarders, then throw away me.
Which button does not function when being pressed?
To cross the water I'm the way, for water I'm above. I touch it not and, truth to say, I neither swim nor move.
It is a sound of empty, speak and it'll talk back plenty. But all the more you yack, you'll get the same words back.
I have two bodies joined together as one. When standing still I run and run.