Answer:
The more you take away from me the bigger I shall get.
I am a box which holds keys but not locks. With the right combination, I may unlock your soul. What am I?
I am black white and read all over.
What loses its head in the morning but gets it back at night?
I am an activity dogs are very good at when a ball is thrown.
Give it food and it will live, give it water and it will die.