【高一冠词问题,求高手帮忙看看啊Inadditiontothegeneralrequirements,anapplicantmusthave___master'sdegreein___fieldoflaw.横线上分别填a,the还是零冠词?怎么判断是特指还是泛指?若名词后跟in+sp.或for】

　　高一冠词问题,求高手帮忙看看啊

　　Inadditiontothegeneralrequirements,anapplicantmusthave___master'sdegreein___fieldoflaw.

　　横线上分别填a,the还是零冠词?怎么判断是特指还是泛指?若名词后跟in+sp.或for或of呢?能不能讲解一下怎么判断?有无什么规律?方法?