Answer:
I have a little pool with two layers of wall around it. One white and soft and the other dark and hard. Amidst a light brown grassy lawn with an outline of a green grass.
What is always coming but never arrives?
I help you carry your books.
I have a small hill with seven holes. What am I?
What has feet and legs, and nothing else?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.