请帮忙判断英语定语从句的先行词.

请帮忙判断英语定语从句的先行词.There are many books here,none of which belongs to me.China has a lot of famous writers,one of whom is Luxun.She mentioned a magazine,the title of which I have forgotten.The factory produces half a million pairs of shoes every year,80% of which are sold abroad.