Here are the sentences completed with the correct verb forms in the past simple tense:

1. The bus **had left** by the time I got to the bus station.

2. I discovered that the house’s key **had been left** at Alice’s place.

3. The thief **stole** two diamonds – reported by the policeman.

4. My mom **confessed** that she **had forgotten** my birthday.

5. The house **was damaged** heavily after the previous owner **had abandoned** it.

6. The neighbor **broke** John’s car after they **had** an argument.

7. The horse **refused** to eat after its owner **had passed away**.

8. Alice **had lost** her direction before Jack came.

9. Their parents **were traveling** to Indonesia when they **returned** home.

10. I **had bought** the tickets before I came to the cinema.

11. I asked Alice how many novels she **had read** last month.

12. I know that I **have seen** that actress somewhere before.

13. My father admitted that he **had sold** my bicycle after I **came** to my school.

14. The students organized a cheer-up party after they **had passed** all the exams.

15. Did you **prepare** the pijama before you came here?

16. What **happened** to you after I **left**?

17. My flowers **were damaged** after that little boy **had played** with them.

18. The band **disbanded** after that scandal **happened**.

19. When Alyssa came, her favorite cake **had been sold**.

20. Before I **left** home for college, my mom **gave** me many gifts.

21. Which book **did you borrow** when you came to that library?

22. I **had bought** many clothes before I **came** to the beach.

23. The dormitory **was renovated** before the students **returned** from their vacation.

24. The dogs **had been adopted** before I **came**.

25. They **married** as soon as they **graduated**.