I. Choose the word whose underlined part is pronounced differently 10. A. safety B. waste C. taste D. chat 11. A. jumped B. loved C. washed D. liked 12. A. secret B. belt C. let D. center 13. A. traffic B. same C. crash D. jam 14. A. hour B. rehearse C. helicopter D. perhaps 15. A. let B. jet C. vehicle D. success 16. A. worked B. played C. studied D. lived 17. A. safe B. nature C. mall D. face 18. A. own B. crowd C. know D. window 19. A. celebrate B. candle C. cake D. racing 20. A. hour B. rehearse C. perhaps D. helicopter