Sentence 1: Dusty let his friends borrow his car. 
 Sentence 3: Dusty was upset, but filled his tank 
 Sentence 4:  Dusty's friends asked to borrow the car again 
 Sentence 5:  Dusty refused to loan them the car 
 Option 1: They returned the car with barely any gas. 
 Option 2: They returned it with a full tank of gas.