Answer:
What is full of holes but still holds water?
I plow and plow but never sow.
What is black when it's clean and white when it's dirty?
Whoever makes it tells it not. Whoever takes it knows it not. Whoever knows it wants it not
What has a neck but no head?
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.