If part of your assignment is blurry so that you cannot read it, that means you need to answer a question before moving on to the next part of the text. At the end of the section that is not blurred out, you will see an icon that says "Q1" - if you click this, it will open a question in the questions panel for you to answer. Make sure you've read the text carefully before you answer the question. If you get it wrong, you will be allowed to answer again until you get it right. Once you get the right answer, it will unlock and unblur the next part of the text so you can keep reading. You will continue to see questions throughout the text that you need to answer.
Your teacher will see how you answered on these questions, so think carefully about your answers.