阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空。
Mary took off her shoes and ran over the hot sand. She tiptoed into the water,       (laugh) as a wave washed over her legs. She looked back at her mother,      was sitting under a big umbrella, holding an apple in one hand and a drink in the      .
Just then, a big wave came and       (sweep) Mary's feet, making her fall into the water. She tried to scream,     swallowed some water instead. She didn't know     way was up or down. She pushed with her hand against     sand and came up for air. She screamed desperately and tried hard to swim.
When she       (final) returned to the shore, Mary ran over to her mother, who was standing up      a worried look on her face.
But to her mother’s surprise, Mary said, “This is the       (good)  vacation ever, Mum. Come and play with me in the water.”