BOSTON — The Massachusetts Historical Commission has approved five sites around the state for nomination to the National Register of Historic Places.The nominees are the more than 250-year-old Sargent-Robinson House in Gloucester; the District School No. 4 Greek Revival one-room schoolhouse in Petersham; the M. M. Rhodes & Sons industrial complex in Taunton; the 300-year-old Reeves Tavern farmhouse in Wayland; and the Boston Finishing Works cotton-processing complex in Williamstown.