Which sentence does not contain any errors in comma usage? a. mr. stanford, whose first name is harold, owns two gas stations in our town. b. that wonderful singer, whose voice reminds me of yours will give a concert at the auditorium. c. lucy whom we haven't met, will arrive at the train station in the morning. d. mr. farnsworth whom we know from camp can play the guitar.

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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.”)

Apex english 4 semester 1 read the following story summary. when she was a child, sara hated her piano instructor, mr. singh. she felt she had already mastered the piano, but mr. singh constantly criticized her playing in a blunt and hurtful way. after sara grew up, she realized that mr. singh's strictness was responsible for the only edge she had over other pianists her age and the only reason she was able to succeed in music later in life. she learned to appreciate his tough love. what does the story most clearly suggest about the author's perspective? a. that a person should put his or her talents to good use b. that pursuing one's dream is paramount in life c. that the world is harsh and only the strong survive d. that adults have children's best interests in mind