Choose the word whose underlined part is pronounced differently

I. Choose the word whose underlined part is pronounced differently:
1. A. tooth                            B. clothing                           C. bath                                 D. both
2. A. gather                          B. monthly                           C. father                               D. brother
3. A. though                         B. thank                               C. through                            D. thin
4. A. clip                              B. give                                 C. twice                                D. stupid
5. A. studio                          B. documentary                   C. cute                                  D. study
6. A. favourite                          B. animal                                 C. channel                                D. progamme
7. A. everything                       B. rhythm                                 C. healthy                                D. nothing
8. A. birthday                           B. mouthful                             C. although                               D. worth
9. A. character                         B. channel                                C. school                                  D. schedules
10. A. thirsty                            B. breath                                  C. although                              D. thank