I love the fact that there is a site for that (which I discovered just now). I use BookWidgets on our school platform and that works quite similar.
I have tried 2 tests just �to test� ;) and unfortunately, I didn�t ace these tests, even though my answers were correct. That is quite frustrating.
For example, a test on passive voice. (turn the sentences into passive ones).
�Somebody has drunk all the milk!� My answer: �All the milk has been drunk!�.
WRONG... the correct answer should have been without the exclamation mark according to the answer key.
![](http://www.eslprintables.com/forum/cuteeditor_files/Images/emsad.gif)
�A workman will repair the computer tomorrow.� My answer: �The computer will be repaired tomorrow.�
WRONG... the agent cannot be omitted according to the answer key.
Of course, it happens quite often that mistakes have been made in esl printables, but in most cases, as a teacher, you can pick these out and correct them before you hand over the material to your students.
In short: Victor, great job! Tip to all teachers working with it: make sure to take the tests yourselves before sharing with your students.