这个公园是儿童游乐区，禁止成人进入。

This park is a kids' play ___zone where adults are not allowed.

城市规划师决定将这个区域划分为商业区和住宅区。

The urban planner decided to ___zone this area into commercial and residential sections.

他在考试时完全进入了状态，答对了所有题目。

During the exam, he was completely ___in the zone and answered every question correctly.