the cat went streaking across the garden back to the house w

此处back是副词“向后地”
adv.（副词）
At,to,or toward the rear or back; backward.
在后地,向后地：在、到或向着后面或后部地；向后地,落后地
In,to,or toward a former location:
回到原处：在、到或向着从前的位置：
went back for the class reunion.
参加同班同学会
In,to,or toward a former condition.
回到原先状态：在、到或向着从前的状态地
In,to,or toward a past time.
从前地：在、到到向着过去的年代地
In reserve or concealment.
储存地或隐蔽地
In check or under restraint:
阻挡地：处于被节制或被隐瞒的状态：
Barriers held the crowd back.
栅栏将群众挡住了
In reply or return.
回答或归还