Answer:
Before Mount Everest was discovered what was the highest mountain on Earth?
With three leaves, I am just a plant. Add another leaf and everyone will want me for good luck. What am I?
I can be cracked, made, told, and played. What am I?
Tear me off and scratch my head what once red is now black.
I am a chair that can move. What am I?
What language does a billboard speak?