Which sentence uses simple parallel structure?

(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.”)

The truck driver backed his vehicle between two buildings, he did not have an inch to spare on either side. fragment, run on, or complete sentence?

The story is about a postmaster who is trying to adapt to the new life in the village of ulapur. in what way is the postmaster's life different from his life in urban calcutta?