Answer:
Roast, boast, coast, post. What do you put in a toaster?
I build bridges of silver and crowns of gold. What am I?
An action done on mosquito bites
Who plays when he works and works when he plays?
Take away my first letter take away my second letter take away all my letters and I would remain the same.
No matter how little or how much you use me, you change me every month.