CREATE TABLE table_34561 ("Year" TEXT, "Team" TEXT, "Progress" TEXT, "Score" TEXT, "Opponents" TEXT)

Which Opponents have a Year of 1999 2000, and a Team of leeds united?
SELECT "Opponents" FROM table_34561 WHERE "Year" = '1999–2000' AND "Team" = 'leeds united'
SELECT "Opponents" FROM "table_34561" WHERE "Team" = 'leeds united' AND "Year" = '1999–2000'