小题1:There are 50 students in our class, 23 of whom are from countryside.
小题1:Tomorrow they will go to visit the factory where the computers are produced
小题1:Do you know the old woman with whom our headmaster is talking?
小题1: I will never forget the day when I first go to school
小题1:Yesterday I borrowed five books from the library, two of which are about music.
小题1:这题翻译时用非限制性定语从句：“他们中有23名”用“23 of whom”表示
小题1:这题也是定语从句，因为修饰的是the factory，所以用 where 引导定语从句，where在定语从句中做地点状语。
小题1:这题是定语从句，先行词是the old woman，“和我们校长谈话的”用介词with+ whom引导定语从句，with是和后面的talk搭配
小题1:这题也是定语从句，因为修饰的是the day所以用when引导定语从句，when在定语从句中做时间状语。
小题1:这题翻译时用非限制性定语从句：“其中2本”用two of which。