Answer:
A skin have I, more eyes than one. I can be very nice when I am done.
I am the greatest teacher out of them all, but alas in the end I kill my pupils.
My prefix is food. My suffix is rude. My infix comes in rounds. I keep you off the ground. What Am I?
It stands upright and can be quite grand. Its secret is not hidden but right at hand. What is it?
As soft as silk, as white as milk, as bitter as gall, a thick green wall, and a green coat covers me all.
What is always coming but never arrives?