Sentence 1: Cam had a dollar for lunch. 
 Sentence 3: He retraced his steps, but could not find it 
 Sentence 4:  He told the store manager he had lost his dollar 
 Sentence 5:  The store manager gave him some lunch for free 
 Option 1: While he was at the store, he dropped his dollar. 
 Option 2: While he was at the store, he spent it on chips.