1) (Boy)toy-boys toy ( пример)
2)(Cat)house-
3)(Ann)book-
4)(Boys)copybooks-
5)(Dan)car-
6)(Girls)dolls-
7)(My parents)flat-
8)(My friend)camera-
9)(My grandparents)garden-
10)(My sister)phone-

правильно\

cat`s house ann`s bookboys` copybookdan`s cargirls` carmy parents` flatmy friend`s cameramy grandparents` gardenmy sister`s phone