Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_76 (circuit VARCHAR, fastest_lap VARCHAR, date VARCHAR)
### Question:
What circut has an unknown fastest lap on July 19?
### Answer:
SELECT circuit FROM table_name_76 WHERE fastest_lap = "unknown" AND date = "july 19"