Across
- 3. simple past of keep
- 6. past of destroy
- 8. past of investigate
- 11. past of happen
- 12. past participle of become
Down
- 1. simple past of switch
- 2. past participle of decide
- 4. simple past of tell
- 5. past participle of freeze
- 7. past of shut
- 9. simple form of shook
- 10. simple form of improved