Answer:
You see a boat filled with people. It has not sunk but when you look again you don't see a single person on the boat. Why?
I get paid to shoot people then blow them up.
I am a band that does not perform sing or act.
I am the building with the most number of stories. What am I?
What is full of holes but still holds water?
No matter how little or how much you use me, you change me every month.