1) Last summer the Barker children had wonderful holidays in Russia, didn't they? - Yes, they did. John and Sally loved Moscow and they enjoyed St Petersburg very much.
2) They didn’t travel to Russia by plane, did they? - Yes, they did. They travelled to Moscow by plane.
3) The Smirnovs met John and Sally at the airport, didn't they? - Yes, they did.
The Smirnovs met them at the airport.
4) The Barker children didn’t stay at a hotel in St Petersburg, did they? - Yes, they did. In St.Petersburg they had a room in a small hotel.
5) In Moscow John and Sally listened to an opera in the Bolshoi Theatre, didn't they? --- No, they didn't. They saw a ballet in the Bolshoi Theatre.
6) In St Petersburg they had a boat trip, didn't they? - Yes, they did. They had a boat trip under the beautiful bridges of the city.
7) The Anichkov Bridge wasn’t their favourite, was it? - Yes, it was. They decided that the Anichkov Bridge was their favourite.
8) John and Sally sent the Smirnovs an e-mail, didn't they? - Yes, they did.
They sent the Smirnovs an e-mail to thank them.