1 The scientists did a long term research on AIDS. the scientists has done a long~~~~. 2. I would rather die than marry him. 3. he does not laugh but cry. 4. I found a secret by chance. 5. scientist 6. singer 7. dancer 8. writer 9. painter 10. biologist 11.artist 12. musician 13.数学家 14. 化学家 15. 地理学家...