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100

What has keys but can't open locks?

A piano, organ, clavichord, etc.

100

I am not alive but I can die; I'm not solid but I can melt.  What am I?

Ice.  Think, "Frosty the Snowman."

100

What goes up and down stairs without moving?

A carpet.

100

I run, but have no legs.  What am I?

A nose.

100

Take one out and scratch my head, I am now black but once was red.

A match.

200

The more there is, the less you see.

Darkness.

200

What has a foot on each side and one in the middle?

A yard stick.  A yard is three feet long.

200

What goes up but never comes down?

Your age.

200

I look at you, you look at me.  I raise my right hand, you raise your left.  What is this object?

A mirror.

200

What can fill a room but takes no space.

Light.

300

They come at night without being called and are lost in the day without being stolen.  What are they?

Stars.

300

What has to be broken before it is used?

An egg.

300

What do you serve that you can't eat?

A tennis ball

300

The more you take, the more you leave behind

Footsteps.

300

What goes around the world and stays in a corner?

A postage stamp.

400

Remove the outside, cook the inside, eat the outside, throw away the inside.

Corn.

400

What gets wetter the more it dries?

A towel.

400

You can't keep this until you've given it.

A promise.

400

What do you fill with empty hands?

Gloves.

400

What question can you never say yes to?

Are you asleep?

500

What's the greatest worldwide use of cowhide?

To hold cows together.

500

What comes once in a minute, twice in a moment, but never in a thousand years?

The letter "M."

500

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person.  What am I?

A pencil (the lead or graphite in pencils comes from mines).

500

A barrel of water weighs 20 pounds.  What must you add to it to make it weigh 12 pounds?

Holes.

500

You see a boat filled with people.  It has not sunk, but when you look again you don't see a single person on the boat.  Why?

All the people on the boat are married.  There are no single people on the boat.