你应该在睡前刷牙。

You ___should brush your teeth before bed.

你应该每天喝八杯水。

You ___should drink eight glasses of water every day.

按照计划，会议应该在下午三点开始。

The meeting ___should start at 3 PM as scheduled.

如果你迷路了，记得给我打电话。

If you ___should get lost, remember to call me.

如果你有空的话，应该来参加我们的聚会。

You ___should come to our party if you're free.