The photo. (24..).

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.

2. The man paid for his new car in cash.
3. I already ate breakfast by the time the others woke up.
4. It snowed for three days when suddenly the sun came out.
5. Sam worked here for six years before he left to go the university.
6. Liz went to the Bahamas for her holidays last year.
7. We watched a film on TV when our guests arrived.
8. They already saw the film twice at the cinema when she rented it on video.
9. The teacher taught the children a song yesterday.
10. He sat on the train at this time yesterday morning.
Hope this helps! :)