Chuyển các câu sau sang bị động 11. The German didn't build this factory during the Second World War 12. The Greens are going to paint this house and these cars for Christmas Day 13. Ann had fed the cats before she went to the cinema. 14.The students have discussed the pollution problems since last week. 15.Have the thieves stolen the most valuable painting in the national museu 16.Some people will interview the new president on TV. 17.How many languages do they speak in Canada? 18. Are you going to repair those shoes? 19.He has broken his nose in a football match. 20.Have you finished the above sentences?