Answer:
What has fingers and a thumb but no hand?
The more you take away, the bigger it gets.
What's always coming, but never arrives?
What is always on its way but never arrives?
If there are three cups of sugar and you take one away, how many do you have?
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?