如今孩子们挑战父母权威的程度远比过去高。

Children ___challenge their parents' authority far more nowadays than they did in the past.

他的女儿刚刚挑战了他，他正艰难地做决定。

His daughter had just ___challenged him and he was struggling for a decision.

她决定在会议上挑战新政策。

She decided to ___challenge the new policy at the meeting.