Choose the word whose underlined part unpronunced differently from the others

Choose the word whose underlined part inpronunced differently from the others:

1.A.run                        B.fun                          C.sun                          D.music

2.A.wet                       B.pretty                      C.rest                          D.better

3.A.thanks                  B.father                     C.thirsty                       D.theater

4.A.great                     B.greet                      C.agian                       D.arrange

5.A.invitation               B.May                       C.late                           D.apartment