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

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

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    59．A．us                                      B．others                                   C．them

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

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    57．A．If                                             B．Because                               C．Although

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    56．A．problem                               B．work                                    C．heart

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

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    54．A．Why                                    B．How                                     C．When

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    53．A．worried                                B．thankful                                C．surprised

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