Answer:
The dirtier I get, the whiter I am. What am I?
I am a word. I become longer when the third letter is removed.
Born of sorrow, grows with age, you need a lot to be a sage. What is it?
Soft, hairy, from door to door. I am the pet that always stays on the floor. What am I?
I can be written, I can be spoken, I can be exposed, I can be broken. What am I?
What language does a billboard speak?