Fill in the blank doesn't get rendered

Created by: dtu-compute

begin:text
Long text over several lines which will be parsed by Markdown.
end:text

begin:fill_in_the_blank
  text "Which %4% is %7%?"
end:fill_in_the_blank

begin:fill_in_the_blank
  text "Which %4% is missing?"
end:fill_in_the_blank

begin:survey
text 'what did you think of this servey?'
end:survey