Sentence 1: Tom decided one day to climb the tall mountain. 
 Sentence 3: It was rocky and full of trees so the trek up was slow 
 Sentence 4:  Near the top he almost fell off a cliff but was able to avoid it 
 Sentence 5:  Finally after a few hours of hiking he reached the summit 
 Given Sentence 2: He was constantly coughing and I felt really bad.