Ice Breaker

What has cities, but no houses; forests, but no trees; and water, but no fish?

A red house is made from red bricks. A blue house is made from blue bricks. A yellow house is made from yellow bricks. What is a green house made from?

What is harder to catch the faster you run?

What can be swallowed, but can also swallow you?

First I am dried, then I am wet. The longer I swim, the more taste you get. What am I? 

I am a box that holds keys without locks, yet they can unlock your soul. What am I?

Until I am measured, I am not known. Yet you miss me, when I have flown. What am I?

Some try to hide, some try to cheat, but time will show, we always will meet. Try as you might, to guess my name, I promise you’ll know, when you do claim. Who am I?

I weaken all men for hours each day. I show you strange visions while you are away. I take you by night, by day take you back. None suffer to have me, but do from my lack. What am I?

What has no hands but might knock on your door, and if it does you better open up?