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1) Last summer the Barker children had wonderful holidaysin 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 Sally 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...?

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.