Answer:
I fly yet I have no wings. I cry yet I have no eyes. Darkness follows me. Lower light I never see.
Everyone in the world needs me. They generously give me but never take me. What am I?
Although it sounds like I work on a transportation device I actually work in a restaurant.
Flat as a leaf, round as a ring; have two eyes, can't see a thing. What am I?
I am black of eye and bright of hair. I fast into the ground and follow my lord as he races around the world. 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.