题目内容：

在下面对话 的空白处填入适当的话语（话语可能是一个句子，也可能是一个短语或一个单词），使对话意思完整、语法正确。

A：Hello，Mary! What are you doing this summer vacation?

B：I’m1._______________ my sister in America．I’m 2.____________ America on Saturday．How about you，Tom?

A：I’m 3.___________________ the mountains for about a week。

B：Oh. That sounds great! 4._________________?

A：This Sunday after noon．

B：And you, Susan? What are you doing then?

C：I’m going to the beach5._____________. My parents like to swim a lot.

A：So we are all going to have fun this vacation．How nice!

B：And we will talk about our vacations when we come back。

A、B and C：Oh，yeah!