transformations: non-defining

Make one sentence from two. Use the sentence in brackets to make a non-defining relative clause. You´ll need to use who(m), whose, which and where

1. Mary is away from home a lot. ( her job involves a lot of travelling)
Mary, , is away from home a lot.
2. My brother George works in an office. He lives in Ireland.
My brother George, , works in an office.
3. Asturias is the most beautiful region in Spain. (I live there)
Asturias, , is the most beautiful region in Spain.
4. Mary is one of my best friends. I have known her since I was 4.
Mary, , is one of my best friends
5. The new shopping centre will be opened in March. It can hold 100 shops.
The new shopping centre, , will be opened in March