Ответ:
Краткое пояснение: Используем was для единственного числа, were - для множественного.
- My sister was at the cinema yesterday.
- The books were on the shelf an hour ago.
- I was very tired after school.
- We were in London last summer.
- It was cold and windy last Sunday.
- The children were happy to see the clown.
Ответ: was, were, was, were, was, were