What am I riddles

I take what you receive and surrender it all by waving my flag. What am I?

I have four legs. I live in Africa. I am big and grey. I live in the river. What am I?

You can easily touch me, but not see me. You can throw me out, but not away. What am I?

I have more than 80 keys, but I cannot open any lock. What Am I?

I have foot, but there are no legs! What Am I?

What am I?

You write on me and secrets I can keep. In places never seen. I spin like a top. Though stiff as a board, I'm often described like a mop. What am I?

I'm a soft and furry pet. I have four legs and a long tail. I have sharp teeth and claws. I like to chase mice. I am a...

Poke your fingers in my eyes and I will open wide my jaws. Linen cloth, quills, or paper, I will devour them all. What am I?

I am always will be coming, but I will never come. What Am I?