如果你想到更合适的词，可以随时替换掉这个表达。

If you think of ___a word that fits better, you can replace this expression anytime.

关于这次会议，我有句话要特别提醒你。

About this meeting, let me give you ___a word of caution.

她提醒我要准时参加会议。

She gave me ___a reminder to attend the meeting on time.

我没听到关于这件事的任何消息。

I haven't heard ___a word about this matter.