Sentence 1: Juanita has felt increasingly tired at work. 
 Sentence 3: Finally a coworker convinces her to drink iced coffee through a straw 
 Sentence 4:  Juanita begins drinking iced coffee every day at work 
 Sentence 5:  Now Juanita no longer feels tired when she is at work 
 Option 1: She has recently started drinking several energy drinks a day. 
 Option 2: She avoids coffee because she is afraid it will stain her teeth.