Sentence 1: Kelly and Sarah were best friends. 
 Sentence 3: Kelly called Sarah names and said things that she couldn't take back 
 Sentence 4:  The girl have not talked since the fight and avoid each other 
 Sentence 5:  Now they both wonder what might have been 
 Option 1: One day, Kelly and Sarah got into a big fight. 
 Option 2: Kelly and Sarah never got into arguments with each other.