用所给单词的适当形式填空。

1. "Animal Helers"is an ____    (organized) to help disabled people.

2. There are many patients at the             (doctor)

3. You shouldn't spend too much time    ____ (visit) your friends.

4. It's fun            (see) all my old friends again.

5. I stayed at my ______ (aunt)for the whole vacation.

公安科研包括社会科学的研究和技术科学的研究。( )