Answer:
What can be any size or shape and gets bigger the more you take from it?
Mouth up it gets filled, mouth down it gets empty.
You row in one while you float.
What never asks questions but receives a lot of answers?
What can you never get rid of when you lose it?
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?