Употребите s,'s,s'
1)This is a new addition of Esenin... poem...
2)That man was Vera... and Nelly... old teacher of music
3)Those were Nick... and Kate... parents
4) Tchaikovsky... house in Klin is now a museum
5)We spent a week... holiday at the Narton...
6)The book is neither John... nor Mary...
7) This is Mary... jacket
8)These are Jill... and Bob... bicycle...
9)Whose dog is it? It... Helen...
10) Paul... and Tina... house