It‘s impotant for us to () a word or phases according to the

It‘s impotant for us to () a word or phases according to the situation in
a.hold b.take c.bring d.employ
the mother didn`t know who___for the broken glass.
A.blamed B.blames C.is to blame D.will blame
这第2题我觉得时态是不是都有问题,话说blame这个词是不是有什么地方特殊,例如固定用法没有被动什么的?