Sentence 1: Susan saw a cute guy in math class. 
 Sentence 3: Susan sat behind him and stared at the cute guy 
 Sentence 4:  The teacher asked Susan why she was in the wrong class 
 Sentence 5:  Embarrassed, Susan stood up and went to her class 
 Option 1: She followed the cute guy to his science class. 
 Option 2: She followed him to their next class together.