What was the score of the game that was played on a grass surface?
CREATE TABLE table_6978 (
    "Date" text,
    "Tournament" text,
    "Surface" text,
    "Partnering" text,
    "Opponents in the final" text,
    "Score" text
)
SELECT "Score" FROM table_6978 WHERE "Surface" = 'grass'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What was the score of the game that was played on a grass surface? ### Input: CREATE TABLE table_6978 (
    "Date" text,
    "Tournament" text,
    "Surface" text,
    "Partnering" text,
    "Opponents in the final" text,
    "Score" text
) ### Response: SELECT "Score" FROM table_6978 WHERE "Surface" = 'grass'