Which one piece of advice would you give a teacher who wanted to create their own classroom material?

Which one piece of advice would you give a teacher who wanted to create their own classroom material?

For listening or reading lessons have a variety of questions that include lower order thinking & higher order thinking. That is, questions that are easy to answer and questions that are a little more challenging to answer. The lower order thinking tasks (e.g. what colour was the car?, how many...?) should be questions that most students can answer by interacting with the text. The higher order thinking tasks (e.g. why do you think she did that?) are the ones that perhaps can challenge the students who quickly finished the first set of questions.