Answer:
What instrument can make any sound and be heart, but not touched or seen?
What word in the English language uses all five vowels plus Y in alphabetical order, and uses each only once?
Who is it that rows quickly with four oars, but never comes out from under his own roof?
Find an English word that uses all of the following letters: PNLLEEEESSSSS
What can you put in a barrel to make it lighter?
What never gets any wetter no matter how hard it rains?