Answer:
You have it even if there is none.
You do this into someone's ear when you want to be discreet.
You use it between your head and your toes, the more it works the thinner it grows. What is it?
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
When it's dirty this should never be aired in public.
I am a room that has a roof but no walls. What am I?
Easy
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?