句型转换，每空一词。

1. That is my friend. (改为复数句)

    Those _______ my_______.

2. —Is that your mother? (作否定回答)

    —No, _______ _______.

3. She is my sister. (改为一般疑问句)

    _______ she _______ sister?

4. That is my brother. (用two sisters改写句子)

    ________ _______ my two sisters.

5. These are oranges. (改为单数句)

     ________ is _______ orange.

原始社会的教育已经从社会生产和生活中明确地分化出来，是专门的社会活动。