either of them is /all of them are一样吗

either of them is /all of them are一样吗 either of them 和 each of them either of them and neither of them 是all of them are 还是 all of they are all of them are in nice boxes,为什么是them All of them are from America相当于 all of them are not students There are two bags in the room,____ of them is new.A.Either All of them end All of them like of them all all of them是什么意思