Sentence 1: One day, a boy had some free time and decided to go to the pet store. 
 Sentence 3: He found a cat he loved and named it Lucy 
 Sentence 4:  He brought Lucy home, but was worried Lucy might not like his dogs 
 Sentence 5:  Luckily, his dogs and Lucy got along very well and were happy 
 Given Sentence 2: The boy loved dogs, but had his attention caught by the cats.