Choose the word whose main stress pattern is not the same as that of the others

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Exercise P8. Choose the word whose main stress pattern is not the same as that of the others.

1. A. maintenance
B. achievable
C. achievement
D. division

2. A. division
B. concentrate
C. distractor
D. punishment

3. A. omission
B. appropriately
C. communicative
D. appropriate

4. A. dangerous
B. popular
C. decay
D. depend

5. A. attack
B. commit
C. attendance
D. effortess

6. A. obstacle
B. essential
C. concentration
D. distraction

7. A. commercial
B. pessimistic
C. impossible
D. optimistic

8. A. optimistic
B. ability
C. purpose
D. surface

9. A. adorable
B. correct

10. A. selfish