Choose the word whose underlined part is pronounced differently

Choose the word whose underlined part is pronounced differently.
36(s). A. walks B. begins C. helps D. cuts
37(ed). A. learned B. sacred C. believed D. decided
38(ed). A. moaned B. presented C. viewed D. robbed
39(ed). A. liked B. learned C. laughed D. stopped
40(h). A. honourable B. honesty C. historic D. hour