Sentence 1: People leave their books in the club room in our building. 
 Sentence 3: My Amazon app said the book was worth $5 
 Sentence 4:  I was going to post it when I saw it was damaged 
 Sentence 5:  I returned the book 
 Option 1: One day I dropped off a book and took one. 
 Option 2: One day I dropped off a book, but did not take one.