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(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.”)

Read and key the following paragraph. 1"the final phase of franklin's public service is themost spectacular. 2after his return to america he waselected to the second continental congress and served withjefferson and john adams on the committee which drafted thedeclaration of independence. 3then, in 1776, he wasappointed one of the three commissioners to seek military andnaval assistance from france. 4for nearly ten years pariswas his center of operations, and, in large part because ofhis personal popularity, he secured the much-needed supportof france and spain and eventually negotiate thetreaty of paris (1783), by which england recognized americanindependence. 5when he returned to america in 1785 he wasold and ill, yet he found strength to serve as a delegate tothe constitutional convention, and to continue his work withmany humanitarian and scientific societies." type the key words for sentence's 2. 3. 4. 5.

Buck did not cry out. he did not check himself, but drove in upon spitz, shoulder to shoulder, so hard that he missed the throat. they rolled over and over in the powdery snow. spitz gained his feet almost as though he had not been overthrown, slashing buck down the shoulder and leaping clear. twice his teeth clipped together, like the steel jaws of a trap, as he backed away for better footing, with lean and lifting lips that writhed and snarled. read this passage. explain what the conflict shows about buck and spitz.