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21. --Have you got________ E- mail address?
   --Oh yes, mine is wjb80 @ yahoo, com.
    A. the                  B. an                   C. a                  D./
22. Mrs Liu teaches________ English. We like________ class very much.
    A. me; his                                  B. me; her
    C. us; his                                 D. us; her
23. It\'s nothing serious. You\'ve just caught________ a cold.