Dans le frigo - a food / drink speaking activity for KS3 to practise il y a / il n'y a pas de

This is a simple but effective speaking activity on Food & Drink for Year 7, practising il y a / il n’y a pas de, and including an information gap.
Split students into pair and give one person in each pair Personne A, the other Personne B.
Person A has to guess what is in their partner’s fridge:
Il y a du lait? Oui il y a du lait / Non, il n’y a pas de lait
Person A write down the items which person B does have in the gaps on their sheet.
You could turn it into a competition so the students take it in turns to ask questions and have to be first to fill the fridge gaps in.
This has always worked with Year 7 groups in the past.
Any feedback welcome!