50．A．us                   B．him                        C．them                      D．you

49．A．next to            B．around                    C．behind                    D．away from

48．A．surprised         B．tired                       C．nervous                  D．lonely

47．A．one day before B．the next day            C．the same day           D．the other day

46．A．got                  B．caught                    C．invited                    D．taken

45．A．saw                 B．forgot                     C．remembered            D．met

44．A．when               B．because                   C．it                           D．though

43．A．airport             B．school                    C．hospital                  D．station

42．A．learned            B．found                     C．sent                        D．told

41．A．bought            B．received                  C．borrowed                D．broke