52．A．think                  B．guess                  C．live                    D．work

51．A．excited               B．worried              C．satisfied              D．disappointed

50．A．luckily               B．happily               C．carefully             D．probably

49．A．that                    B．which                 C．who                   D．where

48．A．However            B．Besides               C．Therefore           D．Otherwise

47．A．dangerous           B．easy                   C．comfortable        D．interesting

46．A．invite                 B．drive                   C．expect               D．fly

45．A．holiday              B．training              C．work                  D．rest

44．A．but                    B．and                    C．so                      D．because

43．A．stopped              B．enjoyed              C．kept                   D．finished