Instructions:
Type in your instructions about how to do the gap fill exercise, put in your text (with
line breaks if you want to put in one gap per line), make ONE gap by typing [ in front of
the word you want to make into a gap, and ] after the word, and put in some feedback.
Repeat for up to 20 gaps. Add some tips (optional) and finally press the 'Make my Gap
Fill' button.