): identify the sentences in the passive voice. 1. the first industrial revolution took place in england. 2. efficiency is achieved by using efficient methods, devices and personnel organisations. 3. automation was first applied to assembly line manufacturing. 4. we rarely use those substances in our research because they are not always available. 5. the fourth industrial revolution will be characterized by the use of automated programmable machines. 6. this pioneer study will involve a lot of difficulty. 7. after dr. robinson had finished that fundamental research he gave a complete account of the work. 8. all the things for the experiment are ready. 9. single shaft turbine generators are being successfully constructed today. 10. the new method will come into use when suitable appliances and devices are provided. 11. the negative results had been obtained before modern equipment was installed. 12. our professor is going to write a paper on the subject of powdered metals. 13. these two principles have been accepted without question by later writers on the subject. 14. the laboratory assistant has described the procedure in detail. 15. a plasma may be completely ionized in which state all the molecules are devided into ions and electrons.