帮我造几个定语从句的句子啊，要求如下

用as引导的：
china is a large country with a long history,as is known to all.
he is not a reliabel person,as you have just said.

they are my good friends,all of whom are already married.
i have met all the talents on the english speech contest,some of whom are really born great orator.
我在那次演讲比赛上见到了所有的人才，有些就是天生的出色的演讲家。

下面是同位语从句，分别用fact 和 reason 。
i can't promise you anything,for the fact that everything changes all the time.
for the simple reason that he excels at all tests,he was admitted to a famous university.

定语从句和同位语从句最重要的区别就是，定语从句中的先行词在定语从句中从当一定的成分而同位语从句中的先行词和后面的句子只是补充说明的关系。

用AS引导的是状语从句吧……