选出下列单词中划线部分读音不同的选项，将其序号填入题前括号内(1×5分)
（1）A. forget     B. her          C. work       D. nurse
（2）A. these     B. father       C. think      D. mouths
（3）A. any       B. catch         C. black      D. stamp
（4）A. book      B. good         C. food       D. classroom
（5）A. pens      B. teachers     C. apples     D. cats