What Am I Riddles

Question: Look at my face, I am somebody. look at my back, i am nobody. What am I?

Question: I open to close but I close to open.
I'm surrounded by water but I'm never soaking.

What am I?

Question: Everyone has me but nobody can lose me.What am I?

Question: You use me from your head to your toes,
the more I work the thinner I grow.

What am I?

Question: I climb to the top I dive below I return again For another show.