I am doing online classes with my Chinese students. The school has specifically asked me to have a "physical presence" with the students, i.e. be seen by the students during class. I am hoping I can find a way to present some material via zoom and then ask students to do, say, questions 1-4 of a quiz, as a kind of formative assessment, then move on to the second mini-lecture and then the second part of the quiz, etc. If I let the student start the quiz without some restriction, they will do it all - whether they know anything or not.