Answer:
Mary's child slept in one of these
I'm a green veggie that looks like a tiny tree.
What is it that you ought to keep after you have given it to someone else?
We are two brothers on opposite sides of the road, but we never see each other. Who are we?
What is something yet nothing, but if you fill it up it will disappear?
Break me and I am better immediately set and harder to be broken again.