Find the word which has a different sound in the part underlined

cần gấp giải giúp mìnhVI.       Find the word which has a different sound in the part underlined
 
1.        A.        beds                           B.        clocks             C.        walls  D.        tables
2.        A.        mothers                    B.        centres          C.        aunts  D.        cousins
3.        A.        cities                          B.        watches        C.        dishes            D.            houses
4.        A.        grandparents           B.        brothers        C.        uncles            D.            fathers
5.        A.        books                         B.        walls              C.        rooms            D.            pillows