1.The life of animals a.Lifes animals
b.Animals' life
c.Animal's life
d.The life's animals
2.The flat of my sister is large.
a.My flat is sister's large
b.The flat's sister is large
c.My sisters flat is large
d.My sister's flat is large
3.The new book of the students
a.The new's students book
b.The student's new book
c.Students' new book
d.The new book's students
4.The toy of their children.
a.Their childrens toy
b.Them childrens toy
c.Their's children's toy
d.The toy of their children.
5.The car of my parents
a.My car's parents
b.The car's parents
c.My parents' car
d.My parents's car