1. must
2. Can
3. may
4. can
5. must
6. must
1. Could
2. could
3. must
4. must
5. may
6. could
7. may
8. must
9. must
10. must
1. must
2. Can
3. may
4. can
5. must
6. must
1. Could
2. could
3. must
4. must
5. may
6. could
7. may
8. must
9. must
10. must