My presentation lives here
As you can see I added a review on using the passive in scientific AW at the beginning
After students had had a chance to explore the problem (repetition of the subject) and the solution (use the passive) they get to rewrite the methodology using the fill in the gaps. To make things harder, I added ‘wrong’ options as you can see below
The presentation concludes with a little summary/ review, ta-da! 
