Sentence 1: Dan and his brother Don have always been competitive. 
 Sentence 3: Dan and Don decided to see who could get the better time 
 Sentence 4:  However, during the marathon, Don fell and could not finish the race 
 Sentence 5:  Dan decided to help his brother instead of finishing the race 
 Option 1: Recently there was a marathon occurring in Boston. 
 Option 2: The missed the marathon occurring in Boston.