CREATE TABLE table_9547 ("Week" FLOAT, "Date" TEXT, "Opponent" TEXT, "Result" TEXT, "Attendance" TEXT)

What team was the opponent for the game played on December 19, 1999?
SELECT "Opponent" FROM table_9547 WHERE "Date" = 'december 19, 1999'
SELECT "Opponent" FROM "table_9547" WHERE "Date" = 'december 19, 1999'