It was summer time _____________ we decided to go to the camp

I don`t know the reason _____________ she is keen on fencing.

He has a friend about _____________ I told you.

He has a friend _______________ I told you about

My friends went to Moscow ___________ they bought the latest collecting of stamps

He bought a book about _________________ I told you

Peter, ______________ brother is a student of our school, must do a science project

This is the skate-park ____________ people can relax and go skateboarding

The woman ______________ hair is grey is my grandmother

A doctor is someone ______________ helps treat sick people