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7. __? C B B B A A C : Let me , it is 28. __. Li Yan: Here you 29. __. You must look after(照看 ) it. : Thank you very much. Li Yan: 30. __ 21. 39。s B. Who39。s C. How39。s D. Whose39。s 22. B. a C. / D. the 23. B. your C. yours D. you39。s 24. B. 39。s C. D. he C 25. B. Excuse me C. Sorry D. How are you 26. B. sorry C. no D. thanks 27. B. desk C. radio D. floor 28. B. yours C. you D. me 29. B. am C. are D. be 30. to meet you. B. Come on! C. You39。re wele. D. It is here.