С. : group the words into three groups: n, v, agi. leave, meet, exercise book, famous, poor, join, song, important, count, learn, subject, spend, floor, picture, easy, different, museum, comfortable, laught, uniform, study, window, rubber, carpet. i ( n ) : ii ( v ) : iii ( agi ) :
Exercise book, song, count, subject, floor, picture,museum, uniform, window, rubber, carpet
II ( v ) leave, meet, join, learn, spend, laught, study
III ( agi ) important,easy, different, comfortable