You must..........in the lesson. Что можно подставить заместо точек???

There are many different ways to complete this sentence:
You must complete the task in the lesson.
You must learn in the lesson.
You must stay in the lesson.
You must understand the teacher in the lesson.
You must read and write in the lesson.
You must follow the teacher and pupils in the lesson.
You must be polite in the lesson.
You must do the exercise in the lesson.
You must stop speaking in the lesson.
Слово lesson иногда можно поменять на слово class, которое также имеет значение УРОК.