Сна используя страдательный залог

6. Antarctica was discovered  by Russian expedition in 1820 year.

7. My friend got lost in the forest.

8. He was found yesterday.

9. The conference will be held next month.

10. The painting was painted with oil.

11. The streets were covered in snow.

12. The field are covered with wild flowers and herbs in summer.

13. This man was kidnapped from his own apartment last year.

14. The flight was cancelled because of  the fog.

15. Prague was founded in X century.

16. Russia is washed by three oceans.