Good Riddles

 
Riddle #174 (medium)

Question: You put me in dry but then I get wet.
The longer I stay in, the stronger it will get.

What am I?

Question: It takes ten men ten hours to build a certain wall. How long does it take five men to build the same wall?

What am I? (medium)

Question: A vivid reality, a naked morality, a place where wishes come true.

Riddle #893 (medium)

Question: You can only keep it once you give it to somebody.

What is it?

Riddle #3363 (medium)

Question: When you're given one, you'll have either two or none?