Sentence 1: John and his dad were on their way to the grainery to pick up seed. 
 Sentence 3: They called inside for someone and looked out back, but saw nothing 
 Sentence 4:  Finally the Cashier came out of the bathroom with a sheepish grin 
 Sentence 5:  The three of them shared a laugh about it 
 Given Sentence 2: Larry knew there was a rainbow somewhere.