"N's N" ou "N of N"

Gap-fill exercise

Make a link between the two nouns using N2's N1 or N1 of N2.
Remplissez les blancs en choisissant entre 's ou of
the driver / that car : is my cousin.
the car / that driver : is very expensive.
the party / that leader : was created last year.
the leader / that party : is my uncle.