1. Smallpox which once killed thousands of people every year has disappeared.
2. This is Felicity whose sister you met last week.
3. He swam across the English Channel which is hard to believe.
4. Borges who never won the Nobel Prize was a wonderful writer.
5. Charlie Chaplin whose films amused millions died in 1977.
6. Dr Oley who is a popular dentist in the city is our family's dentist.
7. His sisters whom I saw last are identical twins.
8. The river which flows through Ho Chi Minh City is the Sai Gon River.
9. The girls are performing the play which they rehearsed yesterday.
10. Their parents are anxious about their children who come back late.