我是小小数学家，动脑筋算一算。(18分)
( ) -- Happy birthday! -- ________ A. Happy birthday! B. Good-bye. C. Thank you.
( ) My sister is six. She is ________. old B. young C. tall
( ) I live ________ Canada. A. in B. at C. on
( ) We ________ a happy family. A. am B. is C. are
( ) This is my father, my mother and ________. A. I B. me C. my
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