Answer:

1. shouldn't have

2.might have

3.must have

4.could have

5.should have

6.would have

7. I couldn't have

8. could have

9. might have

10.should have

Explanation:

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Answer:

1. would

2. most hove

3. Should have

4. might have

5. could have

6. couldn't have

7. needn't have

8. shouldn't have