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

3. A. dancer /ˈdɑːnsə/                          B. cycling/ˈsaɪklɪŋ/

    C. traffic /ˈtræfɪk/                            D. balloon /bəˈluːn/

4. A. develop /ˌdɪˈvɛləp/                      B. introduce /ˌɪntrəˈdjuːs/       

    C. discover /dɪsˈkʌvə/                     D. continue /kənˈtɪnju /