Sentence 1: John was determined to get some work done. 
 Sentence 3: He worked for five hours straight 
 Sentence 4:  He felt better about his giant to do list 
 Sentence 5:  John felt most productive when he was working in a good environment 
 Option 1: He sat at his desk to avoid distraction, but Charles talked to him all day. 
 Option 2: He sat at his desk to avoid distractions.