Answer:
What has no hands but might knock on your door, and if it does you better open up?
What ship has no captain but two mates?
I always run but never walk, I sometimes sing but cannot talk, No head on which a hat to place, You always look me in the face.
An image taken from real life
Of these everyone has ten, part of two wholes at the arms end. What are they?
What language does a billboard speak?