Choose the underlined word which is pronounced differently

Choose the underlined word which is pronounced differently.

11.                     A. open.      B. famous.       C. mother.       D. worldwide.

12.                     A. fellow.   B. fireman.      C. Stephen.     D. phonetics.

13.                     A. lack.       B. knowledge.             C. stick.           D. trick.

14.                     A. sir.          B. ice. C. ideal.          D. idem.

15.                     A. comment.           B. certain.        C. cycle.          D. city.
GIÚP MÌNH VỚI.