13. had stopped -> stopped
14. join -> would join
15. I would rather they didn't neglect their work
16. do -> did
17. would see -> saw
18. listened -> had listened
19. start -> started
20. practised -> to practise
Exercise 2:
1. B -> hadn't
2. B -> had taken
3. C -> would join
4. B -> weren't
5. không có lỗi sai?
6. B -> could
7. B -> had bought
Đúng 1
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