Ex2. Mark the letter A, B, C or D on your answer sheet to indicate the word that differs from the other three in the position of primary stress in the following questions.
21. A. consider B. available C. unusual D. reasonable
22. A. avoid B. tired C. sleepy D. toothache
23. A. intelligent B. depression C. vegetable D. triathlon
24. A. service B. donate C. provide D. discuss
25. A. volunteer B. community C. experience D. responsible
26. A. expected B. dangerous C. memory D. article
27. A. literature B. newspaper C. necessity D. memory
28. A. occasion B. potato C. lemonade D. activity
29. A. machine B. rainfall C. problem D. mixture
30. A. nervously B. injection C. carefully D. calorie
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