Greg's brain food riddles

Solutions at bottom

Problems

Number one

What gets wetter and wetter the more it dries?

Number two

What goes up and down the stairs without moving?

Number three

I have holes in my top and bottom, my left and right, and in the middle. But I still hold water. What am I?

Number four

Throw it off the highest building, and I'll not break. But put me in the ocean, and I will. What am I?

Number five

coming soon...

Number one

A towel.

Number two

Stairs

Number three

A sponge

Number four

Paper

Number five

Coming soon...