“Jack and Mike” usually do their homework at school.(对“.”部分提问)

问题描述:

“Jack and Mike” usually do their homework at school.(对“.”部分提问)
怎么答呢?这是我在回答别人问题的时候发现的一道题,WHO,应该后面接DO 还是DOES呢?用THEIR还是HIS

Who usually do their homework at school