1. had to
2. couldn't
3. had to
4. couldn't
5. couldn't
6. could, but had to
7. didn't have to
8. had to
9. couldn't
10. couldn't
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Answers & Comments
1. had to
2. couldn't
3. had to
4. couldn't
5. couldn't
6. could, but had to
7. didn't have to
8. had to
9. couldn't
10. couldn't