51．A．alone                   B．lonely                  C．slowly                   D．fast

50．A．notice                  B．find out                 C．discover                 D．live

49．A．stronger                  B．less unusual             C．more unfamiliar      D．more specially

48．A．lost                     B．winning                       C．beating                  D．losing

47．A．happier                 B．happiness              C．happily                   D．happy

46．A．what to feed         B．how to protect       C．how to play with     D．how to get on

45．A．call for                 B．take care               C．call on                   D．care for

44．A．honest                 B．calm                     C．brave                     D．hard-working

43．A．anyone else          B．someone else’s       C．your partners          D．any other ones

42．A．neither                  B．both                    C．not only                 D．only