Ответ:

  1. book (he) — It’s his book.
  2. apples (we) — They’re our apples.
  3. family (we) — It’s our family.
  4. sisters (you) — They’re your sisters.
  5. grandfather (she) — It’s her grandfather.
  6. cars (he) — They’re his cars.
  7. garden (they) — It’s their garden.
  8. toys (it) — They’re its toys.