用am，is或are填空。

1.That's my father and this        my mother.

    They        my parents.

2.This is my friend and that        my sister.

3.  —_      she your sister?

    —Yes.she        .

4.—       he your brother?

   —No. He        my friend.

5.—          Guo Peng your brother?

   —Yes, he        .

6. I       his friend and he         my friend.

7. —         you Jack's brother?

    —No, I'm not.

8.These          my parents and those          my grandparents.

简述社会服务机构行政计划的价值与意义。