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VIII. Make these sentences active.
Model: The article was discussed by the students.
The students discussed the article.

1. The scientists speak much about this discovery.
2.The students will discuss my report next Monday
3.The inventor has performed the test by himself this day.
4. Professor Boston analyzed The experimental results.
5. the Curies were investigating Radioactivityby for many years.
6. the researcher had detected The presence of radiation before the experiment was over.
7. Russia’s Academy of Science held The seminar on Solid State Physics last year.
8. the group of engineers are examining the new computer program.
9. strength and elasticity characterize the solids .
10. He will have obtained these data by the end of the week.

IX. Open the brackets using the verbs in the Passive Voice.

1. Information is transmitted by radio. (to transmit)
2. A new kind of invisible rays was discovered by Rontgen in 1895. (to discover)
3. The efficiency of this device will be increased next year. (to increase)
4. The engineer was offered an interesting problem at the research institute (to offer)
5. New machinery will have been installed at the plant by the end of the month, (to install) 6. An unusual electric station is being put into operation now. (to put)
7. The explanation of this phenomenon is not given (has not been given) yet. (to give)
8. Yesterday the results of this experiment were proved by the presence of some impurities. (to prove)
9. This engineer is looked upon as an authority in optical electronics. (to look upon)
10. The quality of production has been increased already. (to increase)
11. Many methods of making and storing electric charges have been discovered during the 18th century. (to discover)
12 We have just been shown the tiniest motor. (to show)
13. The discovery of the electrons was followed by the discovery of the proton and neutron. (to follow)
14. After the engine was repaired we could use it. (to repair)
15. What plan was being discussed when the professor entered the lecture hall? (to discuss)
16. The performance of the new computers will be demonstrared tomorrow. (to demonstrate)
17. At present the sunlight is converted into electrical power by special solar panels. (to convert)
18. The robots are being develloped now. (to develop)