Sentence 1: Terri needed a new pair of speakers. 
 Sentence 3: She decided to head to the thrift shop 
 Sentence 4:  She found brand new speakers for a very cheap price 
 Sentence 5:  Terri went home to install her new speakers 
 Option 1: Her friend told her he had some he didn't need that she could have. 
 Option 2: The ones she currently has are always malfunctioning.