Answer:
1. Was it cold outside yesterday?
No it wasn't.
2. Were they sick last week?
No they weren't .
3. Was Don at the office last Saturday?
Yes he was.
4. Was the car expensive?
Yes it was.
5. Were the children excited?
No they weren't
6. Was the store open?
No it wasn't.
7. Was the movie interesting?
Yes it was.
8. Was the food good?
No it wasn't.
Step-by-step explanation:
past tense of to be: was, were, had been