1. Last summer the Barker children had wonderful holidays in Russia, didn\'t they ? 2. They didn\'t travel to Russia by plane, did they? 3. The Smirnovs met John and Sally at the airport, didn\'t they? 4. The Barker children didn\'t stay at a hotel in St Petersburg, did they? 5. In Moscow John and Salli listened to an opera in the Bolshoi Theatre, didn\'t they? 6. In St Petersburg they had a boat trip, didn\'t they? 7. The Anichkov Bridge wasn\'t their favourite, was it? 8. John and Sally sent the Smirnovs an e-mail, didn\'t they?