Answer:
1. Was (irregular)
2. Visited
3. Helped
4. Went (irregular)
5. Had (irregular)
6. Climbed
7. Stayed
8. Used
9. Were (irregular)
10. Left (irregular)
11. Returned
12. Was not (irregular)
13. Did (irregular)
14. Spent (irregular)
15. Did you (irregular)
Step-by-step explanation:
The simple past tense is used to talk about completed actions that took place in the past.
It is usually formed by adding -d, -ed, or -ied, but the simple past tense of irregular verbs vary.