Sentence 1: Sean always liked penguins. 
 Sentence 3: He approached the glass and tapped it 
 Sentence 4:  The penguin waddled toward him awkwardly 
 Sentence 5:  And when Sean presented his hand, the penguin tapped the glass 
 Option 1: When he went to the zoo, he was amazed they were not on exhibition. 
 Option 2: When he went to the zoo, he was amazed to see one in real life.