她下定决心要在一年内精通钢琴。

She ___committed herself to mastering the piano within a year.

这位运动员下定决心遵循严格的每日训练计划。

The athlete ___committed himself to a rigorous daily training schedule.

我们尚未就任何具体的行动方案做出坚定决定。

We have not yet ___committed to any particular course of action.