Answer:
What is something you can give away as many times you want without ever losing it?
Before Mt. Everest was discovered as the highest mountain in the world, which mountain was the highest?
What comes down but never back goes up?
Usually green but can be brown. It's a great place to play or lie down. What is it?
They come out at night without being called, and are lost in the day without being stolen. What are they?
What language does a billboard speak?