Answer:
What gets wetter and wetter the more it dries?
What kind of cup doesn't hold water?
I have eighty-eight keys but cannot open a single door? What am I?
Though I should be unique, you've made most of us the same. I would be stronger, if my characters were stranger.
Humans have two that shrink in the light and expand in the dark
Both a currency and an antlered male. What is it?