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100

I have keys but no locks. I have space but no room. You can enter but can't go outside.

Keyboard

100

I am full of holes but still hold water

Sponge 

100

I am tall when I am young, and I am short when I am old.

Pencil/candle

100

 I go up but I never, ever come back down.

Age

100

I have cities but no houses. I have mountains but no trees. I have water but no fish.

Map

200

The more of me you take, the more you leave behind.

Footsteps

200

 I belong to you, but everyone else uses me more than you do.

Your name

200

I am light as a feather, yet the strongest person cannot hold me for much more than five minutes

Breath

200

I am an odd number. Take away a letter and I become even. What number am I?

Seven 

200

What kind of band never plays music?

A rubber band

300

What five-letter word becomes shorter when you add two letters to it?

Shorter

300

A word I know, six letters it contains; remove one letter, and 12 remain. What is it?

Dozens

300

What has a neck but no head, a body but no legs?

A bottle

300

What can you catch but not throw?

A cold

300

What can you hold without ever touching it?

A conversation 

400

I am made of water, but if you put me into water I vanish. What am I?

Ice 

400

What word of five letters has one left when two letters are removed?

Stone

400

You see me in the middle of "nowhere." What am I?

Letter H

400

I have a thumb and four fingers, but I am not alive. What am I?

A glove

400

What gets wetter the more it dries?

A towel

500

A man dresses in all black, including a black mask, black suit, and black gloves. He walks down a street where all the streetlights are broken. A black car with its headlights turned off comes speeding down the road, but stops just in time to avoid hitting him. How did the driver see him?

Because it was daytime 

500

A cowboy rides into town on Friday. He stays for three days, then leaves on Friday. How is this logically possible?

The name of his horse is Friday

500

Before Mount Everest was officially discovered by surveyors, what was the tallest mountain on Earth?

Still mount everest

500

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

The letter M

500

If you have a bowl containing six apples and you take away four, how many apples do you have?

Four apples (the ones you took)

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