Who wrote the episode where the original air date is july20,2007?
CREATE TABLE table_25716399_1 (
    written_by VARCHAR,
    original_air_date VARCHAR
)
SELECT written_by FROM table_25716399_1 WHERE original_air_date = "July20,2007"
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: Who wrote the episode where the original air date is july20,2007? ### Input: CREATE TABLE table_25716399_1 (
    written_by VARCHAR,
    original_air_date VARCHAR
) ### Response: SELECT written_by FROM table_25716399_1 WHERE original_air_date = "July20,2007"