Sentence 1: Michael decided to become a computer technician. 
 Sentence 3: Within a week, three customers had called to set up appointments 
 Sentence 4:  Michael destroyed two of his customer's laptops 
 Sentence 5:  He ended up having to buy them both a new system 
 Option 1: His girlfriend put an ad in the paper to gather customers. 
 Option 2: He put an ad in the paper to gather customers.