に[決「き」]まっている => A is a given, A must be the case N2
Information, Report
~きわまる/きわまりない(~極まる/極まりない)      => extremely; very ~ N1
[決「けっ」]して~ない => Won’t, isn’t N3
Will, Decision, Doing
いただきます => to receive N4
Benefit
に決まっている => certainly; I’m sure/certain that; it must be the case that ~ N2
[極「きわ」]み/[極「きわ」]まりない => Extremely A N1
Degree/ Level/Amount
てしまった => to finish N4
Description
てっきり...と思う => surely; certainly; without a doubt N3
きり => Only A N3
Degree. Level, Amount
きり => only; just; since; after ~ N2
きり => only; just; since; after ~ N3
と言っていました => Someone said... N4
Speaking