Choose the word whose main stress is placed differently from the others

Choose the word whose main strees is placed differently from the others
Câu 6: A. Opinion B. Relax C. Semester D. Nervous
Câu 7: A. Obtain B. Determine C. Award D. Harbour 
Câu 8: A. Student B. Difficulty C. Brilliant D. Mature 
Câu 9: A. Passenger B. Purchase C. District D. Routine 
Câu 10: A. Technology B. Comfortable C. Activity D. Expêrience