I. Choose the words whose underlined part is pronounced differently from that of the others in each group. 1. A. documentary B. population C. stimulate D. maximum 2. A. supply B. sensitive C. reserve D. universal 3. A. plain B. certain C. faithful D. attain 4. A. final B. writer C. ivory D. widow 5. A. passed B. managed C. cleared D. threatened 6. A. scientists B. bookworms C. deadlines D. flowers 7. A. nations B. speakers C. lessons D. students 8. A. continent B. alone C. combat D. control 9. A. delicate B. prefer C. reference D. schedule 10. A. southern B. courage C. encounter D. brother 11. A. student B. future C. support D. evaluate 12. A. facility B. family C. negative D. company 13. A. developer B. attend C. complete D. technology 14. A. tonight B. dominate C. economic D. support 15. A. facilitate B. applicant C. interview D. provide 16. A. college B. colleague C. engineer D. biologist 17. A. service B. decide C. design D. advice 18. A. alternative B. career C. applied D. approach 19. A. preserved B. embarrassed C. applied D. studied 20. A. tables B. matches C. watches D. houses