Read the excerpt from "Object Lesson, Part 2."

"But this morning's little job," Ellery turned suddenly to the red-haired boy, "you pulled by yourself, Joey."

The thin boy quivered. "Who, me?"

"Yes, Joey, you."

"You got rocks in your skull," Joey whispered. "Not me!"

"I'll prove it, Joey. Hand me the dollar bill I found in your jeans when I searched you."

Why do these words create tension?

They create an uncomfortable situation for Joey.
The sudden movement surprises the reader.
They make the reader wonder what happened before.
They speed up the pacing of events.

(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.”)