insist

stubbornly

She stubbornly insisted that she didn't need any help with the project.

absolutely

My parents absolutely insisted that I finish my homework before going out to play.

gently, quietly

She gently insisted that her daughter wear a helmet while riding her bicycle.

still

He still insists that he paid the bill last month.

rightly

She rightly insists that her children finish their homework before playing outside.

be entitled to

Parents have every right to insist that their children finish their homework before playing outside.

on/upon

She insisted on paying for dinner because it was her friend's birthday.