II. Choose the word (A, B, C or D) whose main stress is placed differently from the others in each group.

3. A. answer /ˈɑːnsə/                           B. reduce /rɪˈdjuːs/

    C. empty /ˈempti/                            D. subject /ˈsʌbʤɪkt/

4. A. national /ˈnæʃənl/                        B. interesting /ˈɪntrɪstɪŋ/          

    C. probable /ˈprɒbəbl/                     D. delicious /dɪˈlɪʃəs/