阅读短文，给下列句子选择正确答案。

Welcome to the Children's Centre. Happy Children's Day! You can do many things here. Look at these students. They're happy. This is Chen Jie. She's drawing pictures. Mike is playing games. Amy is reading a storybook, Wu Binbin is playing chess with a man. John and Sarah are taking pictures. Where's Bai Ling? Look! She's over there. She's writing a diary. Her sister is singing and playing the piano.