Stop making so much noise ____ the neighbor will start complaining.

问题描述:

Stop making so much noise ____ the neighbor will start complaining.

or 不然
停止制造噪音,否则(不然)邻居该抱怨了!

Or? 不要再制造这么大的噪音了,否则邻居们要开始抱怨了!
应该是祈使句加and/or sb./sth. will.