Sentence 1: May was a science teacher at a local high school. 
 Sentence 3: She was happy to be near retirement 
 Sentence 4:  As a new semester began she found herself less involved 
 Sentence 5:  She handed out assignments and browsed the internet all day 
 Option 1: She had been teaching for four years. 
 Option 2: She had been teaching for 40 years.