1) the title of the book - the book's title
2) the toys of my children - my children's toys
3) the hobby of my wife - my wife's hobby
4) the handbags of these women - these women's handbags
5) the life of animals - animals' life
6) the voice of this girl - this girl's voice
7) the letter of Peter - Peter's letter
8) the questions of my child - my child's question
9) the newspaper of last Saturday - last Saturday's newspaper
10) the photo of her boyfriend - her boyfriend's photo
11) the economy of the country - the country's economy