Sentence 1: John was going camping this weekend. 
 Sentence 3: He went to the mall to shop for a new pair of boots 
 Sentence 4:  He saw a pair of waterproof boots that he really liked 
 Sentence 5:  He was able to buy them for 50% off the retail value 
 Option 1: He needed a new pair of boots. 
 Option 2: He needed a new pair of socks.