Решение:
Подбираем личные местоимения (he, she, it, they) к существительным.
- cheese — it
- stars — they
- Robert — he
- grandmother — she
- a newspaper — it
- teeth — they
- a tooth — it
- petrol — it
- Julia — she
- toys — they
- a fox — it
- people — they
- policemen — they
- a post-office — it
- a son — he
- a wife — she
- weather — it
- a king — he
- animals — they
- a horse — it