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31. In 2030, smartphones will become super smart and super thin. The mistake is: A (should be "will have become" instead of "will become") Corrected sentence: In 2030, smartphones will have become super smart and super thin. 32. Rescue work are trying hard to save people in the flooded area. The mistake is: B (should be "Rescue workers" instead of "Rescue work" and "are" should be "is" or singular verb "is trying") Corrected sentence: Rescue workers are trying hard to save people in the flooded area.