Riddles

People buy me to eat but never eat me.who am I?

I start with t and end with t and has t in it.who am I?

Which tire doesn't move when the car turns right?

What gets wet when drying?

It only increases but never decreases

What has one eye but cannot see?

Everyone has it but no one can lose it.what is it?

The more there is the less you see.what am I?

I am tall when I am young and short when I am old.what am I?