Sentence 1: Lizzy was watching monkeys at the zoo. 
 Sentence 3: She scratched her head 
 Sentence 4:  He scratched his head, too 
 Sentence 5:  She realized he was a copy cat monkey! 
 Option 1: One kept staring at her. 
 Option 2: She walked off when they took the monkeys out of their cage to be fed.