Sentence 1: Marcus decided he wanted to get a pet. 
 Sentence 3: One day he decided to adopt a kitten 
 Sentence 4:  He took the kitten home and poured it a bowl of milk 
 Sentence 5:  Marcus was very happy to have adopted a kitten 
 Option 1: He knew he wouldn't get any cats because he was allergic. 
 Option 2: He had always liked kittens but never had one of his own.