영어 문제 아시는 분 알려주세요

1. attend-attended-attended

2. enter-entered-entered

3. shut-shut-shut

4. believe-believed-believed

5. stop-stopped-stopped

6. run-ran-run

7. hurt-hurt-hurt

8. become-became-become

9. bring-brought-brought

10. leave-left-left

11. overcome-overcame-overcome

12. understand-understood-understood

13. mistake-mistook-mistaken

14. spread-spread-spread

15. study-studied-studied

16. forget-forgot-forgotten

17. choose-chose-chosen

18. lay-laid-laid

19. cost-cost-cost

20. be-was.were-been