56． How did Mr． Green want to go to London?__________ ．

   A． By train                         B． By bus                                       C． By airplane

49． A． Because                     B． If                                C． But

48． A． shape                         B． size                             C． weight

47． A． what’s it                     B． where it is                    C． what it is

46． A． easy                           B． important                     C． hard

45． A． refused                      B． agreed                         C． thought

44． A． led                                   B． leading                        C． to lead

43． A． none                          B． all                               C． one

42． A． can                            B． must                            C． may