Answer:
What can be any size or shape and gets bigger the more you take from it?
Before Mount Everest was discovered, what was the highest mountain on Earth?
The more I appear The less you see. So riddle me this: What could I be?
Inside a burning house, this thing is best to make. And best to make it quickly, before the fire's too much to take.
What do you have in December that you don't have in any other month?
I am a room that has a roof but no walls. What am I?