those are model wokers,some of whom are young fellows 类似这种句子

Those are model workers,some_____are young fellows.A.of whom for whom are those present Some of these students are children,__students are young peo Many of -----are young and some are old I have many friends,of whom some are painters. some of whom are english or some of who are english?why? I have many friends of whom some are businessmen.of whom 是做从 Some of those workers are paid for weekly. some of them are old and some of them are young.There women Some of them,and others are young people 必修一英语 一句填空 there are 4- students,some of（ whom） are 15 many of them are young and some are old 为什么要用some