Find the word which is pronounced differently in the part underlined

Find the word which is pronounced differently in the part underlined:

1. A. healthy B. ahead C. seatbelt

2. A. railway B. helicopter C. safety

3.A. frightened B. terrified C. disappointed

4. A. helicopter B. enter C. violent

5. A. traffic B. station C. safety

6.A. amazed B. interested C. disappointed

7. A. break B. seatbelt C. ahead 

8. A. railway B. gravy C. many

9. A. frightened B. terrified C. disappointed

10. A. parade B. station C. later

11. A. frightened B. disappointed C. interested