1. Double fire-resisting doors should be installed in fire-separating walls.
2. A new powerful hydroelectric station is to be built on the bank of this river in some years.
3. Only circular electric orbits have been considered so far.
4. There are different kinds of bricks which have a pleasant appearance and can be obtained with various qualities, colors and textures.
5. In recent times a large number of fundamental particles have been discovered.
6. There is no precise method available to calculate this vast economic waste.
7. This question will be taken up in Chapter 6 where the whole subject of the measurements will be discussed.
8. In order that a body be in equilibrium under the action of any number of forces, two conditions must be satisfied.
9. Furthermore, one need not even know how to make the reaction in question occur.
10. For the detection of any small difference more careful measurements have to be made.
11. There is no new evidence available as to these reactions.
12. To explain this law or applied mechanics one should know theory well.
13. One shouldn`t forget that there are plenty of problems remaining still unsolved.
14. One should take into account a number of reasons influencing this phenomenon.
15. Thus, there is a good agreement between the theory and the experiment.
16. Thus, the agreement between the theory and practice is good.
17. This results in a further reduction of weight.
18. An up-to-date apparatus for use with powders is described in the article.
19. It has become possible to modify the invention so as to bring out the structural features more clearly.
20. They say that new equipment should be tested.
21. One finds it difficult to mix these gases.
22. One may safely expect that this prediction will be quite reliable.
23. Modern highways are still built according to the principles laid down in the 18-th and early 19-th centuries by a Frenchman, Pierre Tresaquet, an Englishman, Thomas Telford, and a Scot, John McAdam, whose name has passed into English in the word macadam.
24. Pre-stressed concrete is traditionally used for beams but now employed for columns, pipes and cylindrical water-towers, storage tanks, etc.
25. A square function fits the data best.
26. The velocity of sound in air varies with the temperature.
27. One should therefore be measuring an average velocity.
28. A theoretical analysis has been applied to predict the behavior of heavy equipment under working conditions.
29. One shouldn`t forget that there are plenty of problems in building remaining still unsolved.
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