Which underlined part is pronounced differently from the other

Which underlined part is pronounced differently from the other.
1. A. needed    B. stopped      C. worked     D. finished
2. A. appliance          B. science                 C. chemistry             D. biology
3. A. hour                  B. happy                   C. household             D. horrible
4. A. uniform            B. unhappy               C. unit                       D. community