题目

I stopped to watch my little girl busy playing in her room. In one hand was a plastic    21  ; in the other a toy broom. I listened as she was speaking to her make-believe little friend and I’ll never forget the words she said, even    22  it was a pretense. She said, “Suzie’s in the corner because she’s not been very    23   . She didn’t listen to a    24  I said or do the things she should.” In the corner I saw her baby doll all dressed in lace and pink. It was   25   she’d been put there to sit alone and    26  . My daughter  27  her “co已知函数在时取得最小值，则____________.