请在演出开始前15分钟到达剧场。

Please arrive ___at least 15 minutes before the show starts.

请提前填写表格以便我们准备好材料。

Please ___prefill the form so we can prepare the materials.

学前班帮助孩子们为正式教育做好准备。

___Preschool helps children prepare for formal education.