CREATE TABLE table_21067 ("Match" FLOAT, "Date" TEXT, "Opponent" TEXT, "Venue" TEXT, "Result" TEXT, "Turbine goals" TEXT, "Attendance" FLOAT, "Report" TEXT)

Name the opponent for 12 may 2008
SELECT "Opponent" FROM table_21067 WHERE "Date" = '12 May 2008'
SELECT "Opponent" FROM "table_21067" WHERE "Date" = '12 May 2008'