I. Past Form

1. happened

2. bought

3. put

4. went

5. went

6. forgot

7. announced

8. remembered

9. found

10. won

II. Past Perfect Tense

1. had reached

2. had stolen

3. had received

4. had never visited

5. had watched

6. hadn't studied

7. had left

8. had eaten

9. had drunk

10. had hidden

100% correct