请用适当的词完成下面的短文，每个空只能填写一个形式正确、意义相符的单词。

It is a Sunday morning. Students don't go to, and parents don't go to work. are many people in the park. Everyone is a good time. Some are playing chess under big tree. Some are singing dancing. Many boys are games on the hill Annie and Lucy are swimming _the pool. is Lisa? She's a kite over there. What about? I'm looking up at the blue sky.