求学霸，回答问题，一定给好评
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76.To plan the vacation.
77.When they are going.
78.In July.
79.By plane.
80.Useless.Because at last they did not know where they are going.
77.When they are going.
78.In July.
79.By plane.
80.Useless.Because at last they did not know where they are going.
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