根据提示完成句子（每空一词）
My mother has nothing against ____(sing) loudly at home.

has nothing against sth./doing sth.意思是“不反对某事或反对做某事”。此题的句意是“我妈妈不反对在家大声唱歌”。故正确答案为sing的-ing形式即singing。

略