…のも無理 (は) ない => It's natural for... N3
Evaluate
のも無理もない => (to be) natural,(to be) understandable N3
Evaluate
もらえまいか => Help... N2
Benefit
いかに … とはいえ => What ever... N3
Things do not match the prediction
... おぼえはない => don't remember... N3
Position, perspective
さえ/にさえ/でさえ => Even N3
Not only, Not even
~にたえる (耐える)    => bear doing ~ N1
てもらえないか => could you please ~ N3
Request
~といえども => even if; even though; despite ~ N1
~といえなくもない => It can be said that ~ N1
Concession
さえ/でさえ => even; so much as; not even N3
とみえて/とみえる => It seems that ~ N1