Modals Test

It is a quick 2-exercise test on modal structures (can, could, must, have to, should, may, be allowed to).
The first exercise is a gap-filling with a correct form (positive, negative, present, past...) of the given modal structures.
The second exercise is a multiple choice out of the two given options.
The key is provided on the second page of the document.
The test can be used for either the practice of modals or assessement purposes.