Answer:
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.
We are five little objects of an everyday sort. You will find us all in a tennis court.
I grow for a surface, even if you cut me. I continue to grow even after death.
What can be swallowed, But can also swallow you?
I am always hungry, I must always be fed. The finger I lick will soon turn red.
When is it bad luck to see a black cat?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?