英语百日誓师誓词可以根据不同的场合和需要进行适当调整，以下是一些常见的誓词内容：

挑战自我，追求卓越

We will challenge ourselves and pursue excellence in every moment of these one hundred days.

团结一心，共克时艰

Together, we will face every difficulty and overcome every obstacle in these one hundred days.

坚定信念，全力以赴

With firm belief and full effort, we will strive for success in these one hundred days.

珍惜时光，不负韶华

We will cherish every moment and live up to our youth in these one hundred days.

勤奋学习，成就梦想

We will study diligently and fulfill our dreams in these one hundred days.

勇敢面对，无畏挑战

We will face challenges bravely and fearlessly in these one hundred days.

坚持不懈，直到成功

We will persevere until we succeed in these one hundred days.

用心准备，迎接挑战

We will prepare ourselves with dedication and meet challenges head-on in these one hundred days.

这些誓词旨在激励学生们在最后的一百天里，保持积极的态度，全力以赴，实现自己的目标。可以根据具体情况进行适当的调整和补充。