Find the word with different sound in the underline part in each line

Find the word with different sound in the underline part in each line.
    1.    A. arrived    B. believed    C. hoped    D. opened
    2.    A. prefer    B. expensive    C. believe    D. energy
    3.    A. underwater    B. umbrella    C. universe    D. understand
II.    Find the word with a different stress pattern from the others in each line.
    1.    A. flower    B. window    C.balloon    D.music
    2.    A. repeat    B. finish    C.discuss    D.suppose