My riddles

For my homework I have to write some riddles,

Try and guess what or who it is.

This is one I made with my class.

People look at me all the time
 I have a large vocabulary,
I can teach people a lot of new things,
I can be mysterious, funny, adventurous, romantic, scary, sad,
I tell stories,
I can take people to other worlds,
What am I?

Here are my ones,

I have ears but no eyes,

I can spread news,

I have numbers

What am I?

I have an eye,

I can not see,

I am small

I am sharp

What am I?

I am black,

Usually I am only seen at day time,

I move when you move,

What am I?

I am an instrument that you can hear, but you can not touch or see me.

What am I?

I am a small room,
but no one lives inside,
 Anytime I am very cold
 What am I?

I can be big,

I have something different to show every week.

If your there,

 You are either wide awake or asleep,

What am I?

The more you dry,

The wetter I am,

I can be fluffy,

But not always

What am I?

I am sharp,

I can change things slightly,

I can be big,

I can be small

What am I?

I have memories, but none are mine ,
whatever's is inside me is what is shown.
If I'm ever different it's because you changed me,
 What am I.

I'm tall when I'm young and I'm short when I'm old. What am I?

Everyday I stalk you all day long,
With every move you make, I will do the same.
I vanish twice a day with the sun's height and fall,
I will follow you anywhere,
What am I?