Sentence 1: Peter was tired of his friend getting bullied every day. 
 Sentence 3: The next time his friend was picked on, Peter asked the bully to stop 
 Sentence 4:  Everyone was amazed when the bully did just that 
 Sentence 5:  Peter befriended the bully over the next few weeks 
 Given Sentence 2: The cave lead into a series of tunnels, and some were very large.