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IV. Change the following sentences into passive voice.
1.These farmers have cut down more and more trees for wood.
2.Mr Minh hasn't taught that course since 2004.
3.No one has used this car for a long time.
.......
4.They have built a new hospital for children in the city.
.....
5.Has anyone fed the dog yet?
6. She has just bought a new dress.