62．In the future．we can make energy by using sea water．

61．In the future．we can work in one city and sleep in another．

59．A．us                                      B．others                                   C．them

58．A．first                                     B．1ater                                    C．finally

57．A．If                                             B．Because                               C．Although

56．A．problem                               B．work                                    C．heart

55．A．smiled to                              B．talked about                          C．agreed with

54．A．Why                                    B．How                                     C．When

53．A．worried                                B．thankful                                C．surprised