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For sentence 21, the underlined part that needs correction is B ("are"). It should be "is" (subject-verb agreement), so the corrected sentence would be: "Our smart furniture is perfect for people who live in small houses and prefer a modern look." For sentence 22, the underlined part that needs correction is B ("use"). It should be "used" (correct form of the verb "to use" in this context), so the corrected sentence would be: "We used to spend our summers in a cottage by a beautiful lake in the mountains." 23. B. create 24. C. write 25. C. married 26. B. new