Find which word does not belong to each group

I.   Find which word does not belong to each group.

      1.   A. reporter                 B. collector                C. gardener                D. newspaper

      2.   A. stamp                     B. album                    C. collector                D. mountain

      3.   A. skating                  B. climbing                C. gardening              D. horse-riding

      4.   A. hate                        B. enjoy                     C. love                        D. like

      5.   A. unusual                 B. favourite               C. popular                  D. common