Just put inside

SELECT * FROM gallery2 WHERE topic_id="1150039" UNION SELECT * FROM gallery2 WHERE topic_id="668279" UNION SELECT * FROM gallery2 WHERE topic_id="885277" UNION SELECT * FROM gallery2 WHERE topic_id="1009493" UNION SELECT * FROM gallery2 WHERE topic_id="1494" UNION SELECT * FROM gallery2 WHERE topic_id="1481988" UNION SELECT * FROM gallery2 WHERE topic_id="475670" UNION SELECT * FROM gallery2 WHERE topic_id="1349042" UNION SELECT * FROM gallery2 WHERE topic_id="1624121" UNION SELECT * FROM gallery2 WHERE topic_id="874327" UNION SELECT * FROM gallery2 WHERE topic_id="480777" UNION SELECT * FROM gallery2 WHERE topic_id="624758" UNION SELECT * FROM gallery2 WHERE topic_id="274875" UNION SELECT * FROM gallery2 WHERE topic_id="1354974" UNION SELECT * FROM gallery2 WHERE topic_id="1633361" UNION SELECT * FROM gallery2 WHERE topic_id="536618"