He left the way that / in which he had stayed an hour before . 定语从句
2. He left the place_ where__he lived for many years. 定语从句
①_ As___is known to us all,paper was first made in China. 状语从句
③___ What_is known to us all is__that__paper was made in China
What_is known to us all 是主语从句,后半句是表语从句.