b) Mark the letter A, B, c or D to indicate the word that differs from the other three in the position of primary stress in each of the following questions.
11. A. explanation B. Celebrating C. fortunately D. Calculator
12. A. understandingB. exhibition C. affirmative D. opposition
13. A. office B. police C. service D. story
14. A. advise B. hurry C. matter D. happen
15. A. manageable B. magnificent C. Considerate D. analysis
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