1)
What is the meaning of "k'Mishpat ha'Goyim Asher Higlu Osam mi'Sham"?
1.
Rashi: The same idolatry that these Nochrim, whom Melech Ashur exiled, did in their homeland, they did here.
2.
Radak, Malbim: Like the Jews exiled from Shomron feared Hashem and served idolatry, so did these Nochrim.