Answer:
You use a knife to slice my head but you weep beside me when I am dead
What is black when you buy it, red when you use it, and gray when you throw it away?
What has a head and a tail, but no body or legs?
I am the tool for inspiring many. Buy me in the store for not much more than a penny. Don't overuse me, or my usefulness will go. What am I?
With a halo of water and a tongue of wood, stone as skin long I stood. What am I?
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.