Решение:
Необходимо преобразовать утвердительные предложения в отрицательные, используя 'wasn't' или 'weren't'.
- There wasn't a pet shop there.
- There weren't big shops there.
- There weren't two train stations there.
- There wasn't a zoo there.
- There weren't big houses there.
- There wasn't a circus there.
Ответ: 1. wasn't, 2. weren't, 3. weren't, 4. wasn't, 5. weren't, 6. wasn't.