他热切地等待着比赛的结果。

He waited ___keenly for the outcome of the match.

她敏锐地注意到老师语气中的微妙变化。

She noticed the subtle change in the teacher's tone ___keenly.

他强忍泪水，却仍能感受到这份悲伤如此强烈。

He tried to hold back tears, but still felt the sadness ___keenly.