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1. Smallpox , which once killed thousands of people every day , has disappeared.

2. This is felicity , whose sister you met last week.

3. It is hard to believe that he swam across the english channel.

4. Borges , who never won the nobel prize , was a wonderful writer.

5. Charlie chaplin, whose films amused millions , died in 1977.

6. His sister , whom i saw ,  are identical twins.

7. Dr Oley , who is a popular dentist in the city , is our family's dentist.

8. The river which flows through Ho Chi Minh city in the Sai Gon River

9. The girls are performing the play which they rehaearsed yesterday.

10. Their parents are anxinous about their children who come back late.

#Team_nhanh_nhẹn