13. The scarecrow sagged on the pole. The corn reached for the heavens. A man dressed in gray was walking through the cornfield. The field rustled as he parted the spears. Soon he reached a breach in the
field. A road cut across the landscape. The man in gray began walking down the road toward the sun. He
walked to a farmhouse and knocked on the door. A man in a white shirt opened the door. "May I help
you?" the white shirted man asked. The man in gray responded, "My name is Julius Cornwall. I've
travelled from the future to deliver a message to you."
Narrator's Perspective:

(1) fire extended humans’ geographical boundaries by allowing them to travel into regions that were previously too cold to explore. (2) it also kept predators away, allowing early humans to sleep securely. (3) fire, in fact, has been a significant factor in human development and progress in many ways. (4) other obvious benefits of fire are its uses in cooking and in hunting. (5) probably even more important, however, is that learning to control fire allowed people to change the very rhythm of their lives. (6) before fire, the human daily cycle coincided with the rising and setting of the sun. (7) with fire, though, humans gained time to think and talk about the day’s events and to prepare strategies for coping with tomorrow. the sentence that expresses the main idea is: (type the number of the sentence. then click “go.”)