select distinct wr_parent from g4_write_qna where ca_name='토익' and (wr_num between '-38979' and '61021') and ( wr_id != '153624' and wr_id != '185306' and wr_id != '159336' and wr_id != '153833' and wr_id != '153657' and wr_id != '153511' and wr_id != '153510' and wr_id != '142282' and wr_id != '142278' ) order by wr_datetime desc limit 0, 15