Sentence 1: Cathy was looking for ideas for the school fair. 
 Sentence 3: Cathy choose the principal, and the vice principal to be in the tank 
 Sentence 4:  At the fair, the dunk tank was a hit 
 Sentence 5:  Cathy was glad to see the tank was such a success 
 Option 1: Cathy decided it would be fun to have a dunk tank. 
 Option 2: Cathy decided it would be fun to have an inflatable obstacle course.