Sentence 1: David invited his friends over during their first day of summer break. 
 Sentence 3: David and his mom filled lots of balloons with water 
 Sentence 4:  The kids laughed as they brought out a giant bucket of balloons 
 Sentence 5:  At once, they began grabbing for balloons and throwing them! 
 Given Sentence 2: The kids excitedly changed into swimsuits.