Sam often plays _____________ his dog at home. [ ]

A. and

B. to

C. with

（）属于我国《继承法》规定的第一顺序法定继承人。

A.丧偶儿媳

B.养子女对其生父母

C.未建立抚养关系的继子女对其生父母

D.孙子女对祖父母