高中英语教师可以背熟的10句开场白话术如下：
Hello, everyone.
How are you today？
Are you ready？
Let's begin.
Read the text together.
Read after me.
Class begins.
You did a good job.
Thank you for your help.
Morning everyone.
这些开场白可以帮助教师在课程开始时建立良好的师生互动，营造积极的学习氛围。建议教师在备课时反复练习这些开场白，以确保在课堂上能够流畅自然地进行教学。