Answer:
What eight letter word has "kst" in middle, in the beginning and at the end?
What goes up but never goes down?
They come out at night without being called, and are lost in the day without being stolen. What are they?
It is a form of plastic money.
I have eighty-eight keys but cannot open a single door? What am I?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.