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1.Charged particles are influenced by electric fields.
2.Thomson’s discovery of electron was followed by many other exciting discoveries.
3.It was found that the substance was radioactive.
4.Steps are taken to increase the production of our plants.
5.The result of the experiment is shown in fig.11.
6.Chemical methods of purifying water are given much attention to at present.
7.The new discovery was being much spoken about.
8.This problem can be solved by a new kind of electronic computers.
9.The performance of the new computer will be demonstrated tomorrow.
10.Samuel Morse believed that electricity could be used to send messages.
11.The new device had been tested for two hours when the chief engineer came and
stopped the experiment.
12. The relay was given its initial position.
13. The molecules of even a good insulator are acted upon by an electric field.
14. The operation of the new device was looked at with great interest.
15. The discovery of the electron was followed by the discovery of the proton and neutron.
16. After the international conference on ecology it has become possible to begin working at environmental problems on a global scale.
17. Some scientists and engineers are working at improving traditional production processes, others are developing new technologies.
18. The new instruments will enable us to determine the level of pollution in our rivers.
19. Our technological advances make it possible to deal with the most difficult problems.
20. Our lecturer’s book on strength of materials is well-known and popular.
21. One must study six years to become an engineer.
22. There is a big library in the new building of our institute. It is a very good library. One may get all the necessary books there and it is possible to keep them till the end of the academic year.
23. It is well-known that technological progress is impossible without electronics, computers, robots and new materials.
24. That ecological problems have become the most important ones at present is evident to all.
25. What is necessary for the students is to get a good qualification.
26. That S.P. Korolyev was the founder of practical cosmonautics is a well- known fact.
27. That theory is combined with practical training is a very good tradition of our educational system.
28. That it is necessary to develop an international ecological program is realized throughout the world.
29. It is evident that electricity will be the energy of the future.
30. The transformer was invented and the first electric lines and networks were set up at the end of the 19th century.
Ответ:
1. discovery
2. exploring
10. experiments
6. achievements
7. research
9. various
8.different
5.observation(s)
3. technology
4.invention
Объяснение: