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. ____ girl over there is ____ English teacher. A. The, an B. A, / C. The, / D. A, a 15. It’s ____ exciting way to shop on the Net. A. a B. an C. the D. / 16. She was ___ founder of ___ order of nuns called the Missionaries of Charity. A. a, an B. a, / C. the, / D. the, an 17. Xi’an is ___ old city with ___ long history, isn’t it? A. a, an B. an, a C. the, the D. the, a 18. Nancy’s sister is ____ English teacher, isn’t she? A. a B. an C