Hello!
Here are two links to help you review the combined use of the past simple and the past continous.
- Aprende inglés Sila: Pasado simple vs pasado continuo (En español)
- British Council Learn English: Past Continuous and Past Simple
Here are some interactive exercises:
1. Exercise 1 (multiple choice)
2. Exercise 2 (fill in the gaps)
Good luck! If you have any questions, feel free to e-mail me or send me a message through Edmodo.