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1. About 60 percent of the students _____ from the south, the rest of them _____ from the north and foreign countries.
¡¡ A. are/is B. are/are¡¡C. is/are D. are
¡¡2. Half of the workers here _____ under 30 _____.
¡¡ A. is/years B. are/year old C. is/years old D. are/years of age