There's a board game called "pass the bomb" available in 'all good toy shops!' If you take the bomb from it to time and come up with a list of subjects you've been doing e.g. le weekend dernier/le weekend prochain/le sport/mes passetemps... each person has to say a sentence about the topic and then pass the bomb to the next person. When the bomb goes off you change topics (you can also eliminate a person, but then have to keep those "out" interested). Year 7 love it to name vocabulary (each person says a number or word covered in the lesson) year 10 also love it and it gives them confidence for the oral! I have used this just timing or using an egg timer, but they prefer passing round a bomb and the time varies each round, which adds a sense of urgency.