There are 11 pdf files all based on the same text.
There is also the TaskMagic3 Mix&Gap file (mtx3) from which the pdfs were printed (using doPDF - http://www.dopdf.com), and which provides access to 18 interactive exercises for use with PCs and / or an IWB. This file requires TaskMagic3. (See http://www.mdlsoft.co.uk/mixandgap.htm for more info about the Mix&Gap component of TaskMagic3.)
See this video tutorial on getting started with Mix and Gap and an introduction to the automatically generated exercises in Mix and Gap:
See this video tutorial which gives a brief introduction to the 7 non-auto-generated exercises in Mix and Gap:
SEE THESE DETAILED VIDEO TUTORIALS on all aspects of creating your own Mix and Gap files to exploit all sorts of texts in TaskMagic3 (by creating interactive exercises and worksheets).