你离开前应该关灯。

You ___should turn off the lights before leaving.

你应该每天喝八杯水。

You ___should drink eight glasses of water every day.

按这个进度，我们明天应该能完成项目。

At this pace, we ___should finish the project by tomorrow.

如果明天下雨的话，我们应该取消郊游计划。

If it rains tomorrow, we ___should cancel the picnic.