Sentence 1: My teacher took us to the farm for a field trip. 
 Sentence 3: He allowed me to climb on top of the zebra 
 Sentence 4:  After my teacher helped me up, I rode it 
 Sentence 5:  It traveled across the farm 
 Option 1: The owner of the farm introduced us to one of his horses. 
 Option 2: The owner allowed us to ride the horse.