Are you from South America/Spain? Because that kind of "problem" gives you if you're studying English at a spanish country. I'll give you the answers, but you won't be able to make sentences with this past tense.
2. Was paying.
3. Was already eating.
4. Was snowing.
5. Was working.
6. Was going.
7. Were watching.
8. Were already seeing.
9. Was teaching.
10. Was sitting.