1. 根据句意，写出画线部分单词的对应词

①Mr. Green is his father and Mrs. Green is his  .

② Look! This Kate and  is Peter.

③My sister is Gina, my   is Tony.

④These are my parents and   are my grandparents.

⑤This is Tom. He is my friend. And that is Linda.   is Tom's sister.