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

II. PRONUNCIATION:
Choose the word whose main stress pattern is not the same as that of the others:
1. A. demonstrate B. stationery C. exhibition D. countless
2. A. customer B. commercial C. outside D. distance
3. A. emigrate B. conduct C. device D. transmit
4. A. directory B. volunteer C. arrange D. invention
5. A. message B. mobile C. patient D. agree
6. A. assistant B. reserved C. telephone D. experiment
7. A. distance B. demonstrate C. message D. commercial
8. A. conduct B. assistant C. introduce D. invention
9. A. customer B. directory C. mobile D. emigrate
10. A. experiment B. introduce C. exhibition D. volunteer