, . (. .) - (, .) it, one, they, .
| It is evening. | . |
| It is said that he has come. | , . |
| It was impossible to dissolve the substance in water. |
it is (was) that (who, whom), .
| It was Popov who invented the radio. | . |
| It was in 1898 that Popov invented the radio. | 1898 . |
, , one they.
One must (one should)
One can .
| One must be careful when handling mustard gas. | . |
| One can easily decompose mer- curic oxide at high temperature. |
I. .
1. It was in 1896 that natural radioactivity was discovered.
2. It is difficult to liberate oxygen from a compound as most of its compounds are very stable.
3. It is the sun that steadily sends out a great amount of radiant energy.
4. On a physical map one can see seas, rivers and mountains.
5. The coming winter, they say, will be extremely cold.
6. One could hardly expect such a turn of circumstances.
7. It is disturbing that many people suffer from health disorders.
8. It is heart disease that is a major cause of death in many countries.
9. It has become clear that there is no single cause of heart disease, but many risk factors.
10. One must change habits or lifestyle to prevent or reduce risks.
II. .
1. , , , .
2. , , .
3. , , .
4. , .
5. .
.
1. It is our diet, especially the amount and type of fat we eat, can increase the risk of heart diseases.
2. One should eat foods that contain polyunsaturated fatty acids to reduce the amount of cholesterol.
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3. It was proved that when oil is processed to make it into margarine, the PUFAs (polyunsaturated fatty acids) to trans fatty acids.
4. It can be hard to change your eating habits and way of life, but it is worth the effort.
5. It is mainly teenage girls and young woman that suffer most from anorexia and bulimia.
D
I. , .
dental caries ['dentql 'kFErJz], periodontal ["pFriq'dOntql], calcium ['kxlsiqm], phosphorus ['fOsfqrqs], micro-organisms ["maikrq'Lgqnizmz], plus [plAs], polysaccharides ["pOli'sxkqraidz], pH [pJeiC], eventually [i'venSuqli]
II. , , .
to turn () to turn into; acid () acidity; with, in within; solution () to dissolve; place to place, to replace; to check () unchecked; to move () to remove; sense (, ) sensible, sensitive; flame () to inflame; blood () to bleed; breath [breT] () to breathe [brJz]; to look () to look at, to look for
III. .
