警察在高速公路上设置了检查站，随机抽查过往车辆。

The police set up ___checkpoints on the highway to randomly inspect passing vehicles.

老师设置了几个检查点来跟踪我们的学习进度。

The teacher set up several ___checkpoints to monitor our learning progress.

游戏会在每个关卡结束时自动创建检查点，这样你就不必从头开始。

The game creates ___checkpoints at the end of each level so you don't have to start from the beginning.