U got 2 options

SELECT * FROM gallery2 WHERE topic_id="1121438" UNION SELECT * FROM gallery2 WHERE topic_id="680639" UNION SELECT * FROM gallery2 WHERE topic_id="677515" UNION SELECT * FROM gallery2 WHERE topic_id="435511" UNION SELECT * FROM gallery2 WHERE topic_id="1558087" UNION SELECT * FROM gallery2 WHERE topic_id="476300" UNION SELECT * FROM gallery2 WHERE topic_id="698465" UNION SELECT * FROM gallery2 WHERE topic_id="760502" UNION SELECT * FROM gallery2 WHERE topic_id="1297145" UNION SELECT * FROM gallery2 WHERE topic_id="9692" UNION SELECT * FROM gallery2 WHERE topic_id="1671791" UNION SELECT * FROM gallery2 WHERE topic_id="899353" UNION SELECT * FROM gallery2 WHERE topic_id="396966" UNION SELECT * FROM gallery2 WHERE topic_id="724561" UNION SELECT * FROM gallery2 WHERE topic_id="1787878" UNION SELECT * FROM gallery2 WHERE topic_id="475989"