Choose the words whose underlined part is pronounced differently from the others

Choose the words whose underlined part is pronounced differently from the others:

      1. a. limestone           b. pilgrim                    c. rickshaw                  d. citadel

      2. a. behaved             b. passed                   c. entertained             d. changed

      3. a. stream                b. beat                        c. defeat                     d. great

      4. a. plumber              b. sculpture                c. measure                  d.structure

      5. a. weather              b. sympathetic            c. worthy                     d. bother