Choose the word which has different sound in the underlined part

 Choose the word which has different sound in the underlined part.

1.   A. prefer                  B. dinner                    C. after                       D. brother

2.   A. turn                       B. put                          C. burn                       D. fur

3.   A. further                B. answer                   C. future                     D. teacher

4.   A. what                         B. water                      C. salt                         D. hat

5.   A. surf                           B. roof                        C. of                         D. father