I have a question about the following. We are conducting a research, for that people have to study a list of 20 Italian-English translations. 10 of those translations will be asked but this has to be randomized. Furthermore, all of these responses can maximum last 15 seconds. They should enter the answer so it is not multiple choice.

I have made a block with all the questions and they are all limited by a timer. So there is a timer question, an open question with the translation, and then there is a new page. This then repeats 20 times. This system works until I install the randomization of the block and select '’present only 10 of total questions'’. It still shows all questions. 

What can I do? 

Thank you in advance!