Easy Riddles

I’m not an airplane, but I can fly through the sky. I’m not a river, but I’m full of water. What am I?

What has six faces, but does not wear makeup? It also has twenty-one eyes, but cannot see.

You use me from your head to toe. The more I work, the thinner I grow. What am I?

Two bodies have I, though both joined in one, the longer I stand the quicker I run. What am I?

What has a mouth but can’t chew?