Answer:
By Moon or by Sun I shall be found. Yet I am undone if there's no light around.
I am an activity dogs are very good at when a ball is thrown.
What insect does a blacksmith manufacture?
What gets sharper the more you use it?
A large oasis in the desert. Come with cash and leave with none. What am I?
No matter how little or how much you use me, you change me every month.