grammar doubts!

0(1) As a small child, Sarah witnessed a horsewhipping of one of the slaves and, even at five years old, she detected something inherently wrong. On March 7, 1870, when she was seventy-nine years old, Sarah led a procession through a blizzard to the local polling place.02br
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00 style guide says to use hyphen in the following cases:02br
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00A three-year-old, a five-year-old child, eight- to ten-year-olds, fifty-five-year-old woman (should be hyphenated in both 01b00noun and adjective forms02b00)02br
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00So, can we use hyphen in the above sentence as "five-years-old" or is it wrong to use? Please clarify.02br
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00(2) Sarah responded with a series of articles in the 01i00Boston Spectator,02i00 comparing the attitude of the church to the witch trials in early American history and countering their arguments point by point. Her knowledge of scripture was likely more refined than most of her contemporaries, including many of those in power in the pulpit.02br
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00Does the second sentence need any correction or rephrasing? Please advise.02br
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00(3) Sarah sold the copies from door-to-door and donated the money to a woman's suffrage journal.02br
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00Do we need hyphen in door-to-door? Please clarify.02br
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00(4) During the period, she learned that Dumont had illegally sold her son, Peter, to an 00 plantation owner. At the time 00 state law forbade the selling of slaves to anyone who lived outside of the state.02br
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00Can "At the time" changed to "At that time"?02br
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00(5) Considered the first feminist pioneer, Margaret Fuller's battles on behalf of woman's rights were equal to any of the other women in the field, although the bulk of her protests were offered through the written word.02br
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00Please check S-V agreement in "the bulk of her protests were"? Should it be was?02br
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00(6) To compensate her in some way for her unselfishness, family friends introduced Fuller to Ralph Waldo Emerson who invited her to visit with him and his family for three weeks during the summer.02br
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00Should it be to "visit him"? Please advise.02br
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00(7) Through Emerson, Fuller was introduced to the Transcendentalist movement, a group of intellectuals and writers with a Utopian vision of life, and through that movement, she met Bronson Alcott, who offered her a position teaching languages at his progressive 00 00 in 00.02br
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00Should it be "who offered her a position of teaching languages"? Please advise.0-