It's in the school. It's crowded at noon. The food is delicious.

What am I?

I work in a hospital.

I help sick and injured people.

I am not a doctor.

What am I?

I work in a classroom.

I help people learn.

I check students' assignments.

It has big airplanes. It is usually crowded and has a lot of shops. You need a ticket.

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

I am white when I am dirty, and black when I am clean. What am I?

To some people I will fool them. To others I'm a mystery. No matter how hard people try I will never go down. What am I?

I shrink smaller every time I take a bath. What am I?