Sentence 1: Mandy was going out of town. 
 Sentence 3: When Mandy got back, her fish had starved 
 Sentence 4:  Mandy asked her friend what happened 
 Sentence 5:  Her friend told Mandy that she'd given the wrong dates 
 Option 1: She asked her friend to feed her fish. 
 Option 2: She asked her friend to feed her dog.