Answer:
What has a mouth but can't chew?
Hard to catch, easy to hold. Can't be seen, unless it's cold.
My love, when I gaze on thy beautiful face. Careering along, yet always in place, the thought has often come into my mind. If I ever shall see thy glorious behind.
Although my cow is dead, I still beat her. What a racket she makes!
Of these things - I have two. One for me - and one for you. And when you ask about the price, I simply smile and nod twice.
I repeat only the last word you say. The more I repeat, the softer I got. I cannot be seen but can be heard. What am I?