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They are preparing dinner in another room.
-> Dinner is being prepared in another room.
Lenin gave each of them two exercise books yesterday.
-> Each of them was given two exercise books by Lenin yesterday.
The 20th century has given us a lot of advantages.
-> We have been given a lot of advantages by the 20th century.
You will have to make great efforts in studying.
->Great efforts in studying will have to be made by you.
We are going to translate HAMLET into our native language.
-> HAMLET is going to be translated into our native language by us.
They used to make the little boys climb the chimneys to clean them.
-> The little boys used to be made to climb the chimneys to clean them.
They didn't look after the children properly.
-> The children weren't looked after properly.
Everyone doesn't look for him everyday.
-> He isn't looked for by anyone everyday.
People recycle car tiers to make pipes,
==> Car tiers are recycled to make pipes
The workers will build a new school in my town.
==> A new school will be built by the workers in my town
1. Car tires are recycled to make pipes
2. A new school will be built in my town by the workers.
1.These films were used for studying
They used these films for studying.
2.Is recycled paper being used ?
DO they use recycled paper?
3.Many tress are cut down to make paper
They cut down many trees to make paper.
4.The work will be finished on time
The will finish the work on time.
Chúc bạn học tốt ^^
1. These film were used to for studying.
=> They used these films for studying.
2. Is recycled paper being used?
=> Do they use recycled paper?
3. Many tress are cut down to make paper.
=> They cut down many trees to make paper.
4. The work will be finish on time.
=> The will finish the work on time.
may mà biết làm cái này 
1, wood pulp is used to make paper
2, the first satellites was launched in to sky long ago
3, the results will be gived you soon
4, the babies will be looked after by her mother (:v, ko chắc lắm)
mình ko chắc 2 câu cuối, vì mình ko giỏi anh văn cho lắm, nắm được phần bị động là may lắm rồi :v
1) The wood pulp is used to make paper.
2) The first satellite was lauched in to sky long time ago.
3) You may be given the result soon.
4) The babies will be looked after by her mother
Chuyển câu sau sang dạng bị động:
You will have to make great efforts in studying.
=>great efforts in studying will have to be made.
Great efforts in studying will have to be made by you.