Answer:
What do you throw out to use and take in when you're done?
I know a word of letters three. Add two, and fewer there will be!
What is lighter than what it is made of?
Thirty white horses on a red hill, first they champ, then they stamp, then they stand still.
I am what remains when nothing is left.What am I?
Both a currency and an antlered male. What is it?