Ответ:
- 1. He sang a song.
- 2. Dad drank two bottles of milk.
- 3. Mum came home late.
- 4. Grandma fished for lunch.
- 5. He went to the zoo.
- 6. We saw the teacher in the park.
- 7. They ate pizza.
Обоснование: Заполняем пропуски глаголами в форме Past Simple, согласно контексту предложений.