Once upon a time there   16  a wise king who wanted to marry off his favorite daughter. He wondered    17    he could find the right person. The king had    18    idea. He decided to hold a contest to decide which gentleman     19   qualify for this great honor. The king announced that anyone who wanted   20   the princess must report to the palace. To win his daughter, a man must fill up a whole room    21    a light thing very quickly.