请用“he，she，it”填空。

1. This is my aunt. ____ is Mrs Brown

2. -Is that your uncle? 

    -Yes, ____ is.

3. ____ is your grandfather think.

4. ____ is your bag, I think.

事物的联系就其与实践的关系来说，可分为（）①自在事物的联系②人为事物的联系③主观臆造的联系④真实的联系

A.①②

B.①③

C.①④

D.②④