user: Question: when was the ship completed when laid down is 21 August 1925?
Columns: ['Kanji', 'Name', 'Builder', 'Laid down', 'Launched', 'Completed']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['睦月', 'Mutsuki DD-19', 'Sasebo Naval Arsenal , Japan', '21 May 1924', '23 July 1925', '25 March 1926']
SQL:

assistant: SELECT "Completed" FROM "Table" WHERE "Laid down" = '21 August 1925';