What can fill a room but takes up no space?

The more you take, the more you leave behind. What are they?

I turn once, what is out will not get in. I turn again, what is in will not get out. What am I?

A man calls his dog from the opposite side of the river. The dog crosses the river without getting wet, and without using a bridge or boat. How?

I am always hungry and will die if not fed, but whatever I touch will soon turn red. What am I?

The person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

Only one color, but not one size, Stuck at the bottom, yet easily flies. Present in sun, but not in rain, Doing no harm, and feeling no pain. What is it?

Who is that with a neck and no head, two arms and no hands?

What is it that, given one, you’ll have either two or none?

When I’m used, I’m useless. Once offered, soon rejected. In desperation, I’m often expressed. What am I?

What common English verb becomes its own past tense by rearranging its letters?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

What has a tail and a head but no body?

What can travel around the world without moving from its corner?

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