我们必须遵守议程，否则会议会拖得太久。

We must ___keep ___to the agenda or the meeting will take too long.

我希望你能紧扣主题！

I wish you'd ___keep ___to the point!

她沿着主干道走，天黑前就到家了。

She ___kept ___to the main roads and was home before dark.