找出每组单词中不同类的一项,将其序号填入括号里。
( )It is _____. A. cry B. crying C. sing
( )The moon is shining ____. A. sad B. happy C. sadly
( )Are you ____ the park? A. on B. in C. at
( )A girl is _____ food in the supermarket. A. buy B. buying C. bought
( )I can ____ you . A. see B. saw C. seeing