50．A．certainly      B．never         C．possibly        D．likely

49．A．made up        B．cried out     C．burst into      D．turned out

48．A．had been observed               B．had been observing                C．had been     D．had been seeing

47．A．apart          B．lonely        C．alone           D．along

46．A．said           B．saying        C．to say          D．and say

45．A．appearing      B．bringing      C．showing         D．giving

44．A．had disappeared                  B．had been disappeared           

   C．was disappearing                                    D．was disappeared

43．A．look into      B．1ook for      C．look up         D．1ook through

42．A．study          B．save time     C．kill time       D．talk

41．A．visit          B．form          C．tell            D．talk