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100

If you have it, you want to share it. If you share it, you don't have it. What is it?

A secret

100

What has no beginning, middle, or end?

A doughnut

100

What kind of room has no doors or windows?

A mushroom

100

What invention lets you look right through a wall?

A window

100

What can travel around the world while staying in a corner?

a stamp

200

The more you have of it, the less you see. What is it?

Darkness

200

What has to be broken before it can be used?

An egg

200

What goes up but never comes down?

Your age

200

What is harder to catch the faster you run?

Your breath

200

He has married many women, but has never been married. Who is he?

a preacher 

300

What gets whiter the dirtier that it gets?

A chalk board

300

What gets wetter and wetter the more it dries?

A towel 

300

What kind of tree can you carry in your hand?

A palm

300

What can you catch but not throw?

A cold

300

If you were in a dark room with a candle, a woodstove, a match and a gas lamp which do you light first?

The match

400

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

A candle

400

You can drop me from the tallest building and I'll be fine, but if you drop me in water I die. What am I?

Paper

400

What two words contain the most letters?

Post office

400

Which weighs more, a pound of feathers or a pound of bricks?

Neither, they both weigh one pound

400

What begins with T, finishes with T, and has T in it?

a teapot

500

What has hands but can not clap?

A clock

500

What has a head and a tail, but no body?

A coin

500

How many of each species did Moses take on the ark with him?

None, Moses wasn't on the ark Noah was.

500

Before Mount Everest was discovered, what was the highest mountain on Earth?

Mount Everest

500

What is so fragile that saying its name breaks it?

silence