Answer:
I am in the middle of water but am not an island.
A young man wants to have me but when he has me he no longer wants me. Blade in hand he attacks me and does his best to remove me. Yet he knows that it is all in vain.
A large oasis in the desert. Come with cash and leave with none. What am I?
I stay where I am when I go off. What am I?
What is the most slipperiest country in the world?
No matter how little or how much you use me, you change me every month.