CREATE TABLE table_70610 ("Poll" TEXT, "Pre- season" TEXT, "Mar. 3" TEXT, "May 5" TEXT, "May 12" TEXT, "May 19" TEXT, "May 26" TEXT, "Final Poll" TEXT)

Which pre-season has May 5 of 21?
SELECT "Pre- season" FROM table_70610 WHERE "May 5" = '21'
SELECT "Pre- season" FROM "table_70610" WHERE "May 5" = '21'