Answer:
I open to close but I close to open. I'm surrounded by water but I'm never soaking. What am I?
I have leaves on my fruit my fruit is on my leaves.
When you need me, you must find me. When you find me, you no longer need me. What am I?
Goes over all the hills and hollows, Bites hard, but never swallows.
No matter how little or how much you use me, you change me every month.
The more of me you take, the more I appear behind you. What am I?