tefl exam question. Help!

I am in the middle of my tefl exam, and I am struggling on 1 question only : Imagine you are teaching the phonemes /l/ and /r/ (/r/ for 'right' and /l/ for 'love'). Your aim is to help your students distinguish between the two sounds and pronounce them as accurately as possible. Remind yourself of the stages (p6) of teaching sounds you covered in module 6 and describe step by step how you would teach these sounds. Remember to give details of a communicative activity at the end. Write about 200 words. I do understand the concept, and stages, Demo, Drill, Check, Do it, Iam struggling on explaining the step by step process i.e. : words to use for the drill section, and phrases / sentences to use to drill the target sound.