Choose the word whose underlined part is pronounced differently

Choose the word whose underlined part is pronounced differently.
6(o). A. occupation B. college C. comfortable D. knowledge
7(ed). A. determined B. researched C. obtained D. harboured
8(i). A. mingling B. simplicity C. variety D. difficulty
9(s). A. insect B. apes C. seal D. whales
10(s). A. forest B. resort C. reason D. visit