Find the word which has a different sound in the part underlined

1 A. (c)ookies B. (c)ook C. (c)omplete D. (c)elebrate
2 A. r(e)lative B. r(e)lax C. r(e)peat D. r(e)duce 
3 A. l(u)cky B. tr(u)ck C. t(u)be D. pl(u)mber
4 A. st(i)cky rice B. t(i)dy C. beaut(i)ful D. del(i)cious
5 A. pl(a)nt B. p(a)goda C. calend(a)r D. americ(a)