Answer:
I fill a room but take no space.
I can be long or short. I can be grown or bought. I can be painted or left bare. My tip can be round or square. (one word)
Ripped from my ancestors home beaten and burned I become a bloodthirsty killer.
The more you work, the more I'll eat.You keep me full, I'll keep you neat. What am I?
It rows quickly with four oars but never comes out from under its own roof. What is it?
Keep doing me to avoid lens dryness