Answer:
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)
I jump when I walk and sit when I stand. What am I?
Never ahead, ever behind, yet flying swiftly past; for a child, I last forever; for an adult, I'm gone too fast. What am I?
The most famous dinner
I am a house with two occupants sometimes one rarely three. Break the walls eat the boarders then throw away me.
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.