Ответ:

1. was, started

2. were watching, heard

3. did you do, was reading

4. saw, was looking

5. crashed, was going

6. did they win, were losing

7. was studying, found

8. did you see, was wearing (тут не уверен), didn't

9. did you do, was just looking

10. was studying (тоже не до конца уверен)

Объяснение:

was/were + ing окончание в словах Past Continuous. действие продолжалось какое-то время

did + инфинитив – Past Simple, действие произошло и не длилось какое-то время, просто произошло