Sentence 1: Cal went to put on his deodorant and discovered it was empty! 
 Sentence 3: Cal wondered what he was going to do to avoid stinking all day 
 Sentence 4:  Suddenly he had a very sensible idea 
 Sentence 5:  Cal used some baking powder under his arms and went to work 
 Given Sentence 2: He hadn't thought to purchase a back up either.