把下面的单词按类别写在相应的括号内：
—What ________ I doing? Guess! —You ________ playing the guitar. A. am; / B. /; are C. am; are
—What ________ she have? —She has a violin. A. do B. does C. has
Wang Bing is looking ________ his book. A. at B. for C. to
— ________ a pumpkin on the desk? —No, there isn’t. A. Is there B. Are there C. There is
Please show ________ how to make the kite. A. we B. us C. our
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