1,I was looking for a book this morning which I have found now 

2,Mrs Smith, who is retired teacher, does volunteer work at the hopsital

3,I live in a dorminoty which residents come from many countries

4,Lake Prespa ,which is on the north Greek border ,is a lonely beautiful lake 

5,The little girl, who sat next to me on the coach , ate candy the whole way 

1. I was looking for a book  this moring.I have found it now
 ⇒ I was looking for a book this morning which i have found now
2.Mrs.Smith does volunteer work at the hopsital.She is retired teacher
 ⇒Mrs.Smith who does volunteer work at the hopsital  is a retired teacher
3.I live in a dormitory.Its residents come from many countries
 ⇒I live in a dormitory whose residents come from many countries
4.Lake Prespa is a lonely beautiful lake.It is on the north Greek border
 ⇒ Lake Prespa which is on the north Greek border is a lonely beautiful lake
5.The little girl ate candy the whole way.She sat next to me on the coach
 ⇒The little girl who sat next to me on the coach ate candy the whole way

$@Lichaeng$