7 Where you yesterday, Sam? - I at the zoo with my mum.

7. Where were you yesterday, Sam? - I was at the zoo with my mum.

В данном предложении необходимо вставить формы глагола to be (быть) в Past Simple.

Where were you yesterday, Sam? - I was at the zoo with my mum.

Ответ: Where were you yesterday, Sam? - I was at the zoo with my mum.