Read and translate the following words and word combinations
1. Chamber: the heart consists of two separate chambers; the right atrium and the right ventricle are in the right chamber;
2. thick: a thick wall; the walls of the left atrium are thick; the left ventricle has thick walls;
3. pulmonary: pulmonary artery; pulmonary circulation; pulmonary function; pulmonary valve;
4. to dilate: dilated; to be dilated; the vessels dilate; the heart dilates and contracts

.1.-open the window.

-but i have opened the window.

2.i have seen the film.

3.he has opened the door.

4.they have cleaned the room.

1. c) to stay

2. a) to have

3. b) stay 

4. c) listening

5. b) is

6. b) for

7. c) no, a) some

8. c) was

9. b) since

10. c) did

11. a) she said she was having breakfast.

12. a) the

13. c) will/-

14. a) the/the

15. b) in

16. a) wants

17. b) off

18. d) in

19. d) shorter

20. b) was already started

21. c) to wake him up

last year my friends and i went to the mountains during our  holidays.    it was amazing. we went skiing and sledding a lot, we were playing snowballs and making a snowman. the weather was perfect: frost and sun, all the time we had to wear  sunglasses as in summer.    in the evening we decided to  have dinner in the hotel restaurant and had fun. after dinner we went to our rooms which  were cosy and bright. so  jacek was  playing the guitar, anna was  singing, i was chatting with my parents, max and alice were watching a funny movie, and martha was playing her favourite computer games.  everybody was relaxing. it was great.  then everybody wanted a drink of tea and veronica brought her thermos. we poured tea in the mugs, the tea was hot and fragrant. but we couldn't drink it, because it was salted!   it turned out that in the morning veronica was afraid to be late, she hurried and confused salt and sugar! everyone laughed. it was really fun.  then we came to the night cafe  on the nineth floor and drank sweet  tea there.  i will remember that salt tea all my life!

chemical pollution of atmosphere.the person pollutes atmosphere in the millenia, however consequences of the use of fire which it used all this period, were insignificant. it was necessary to be reconciled by that the smoke disturbed to breath and that soot laid down a black cover on a ceiling and walls of dwelling. received heat for the person was more important, than pure air and incomplete walls of a cave. this initial air pollution did not represent a problem for people lived then small groups, occupying unreasonably extensive untouched environment. and even the considerable concentration of people in rather small territory as it was in a classical antiquity, was not accompanied still by serious consequences.so was up to the beginning of the nineteenth century. only for last hundred years development of the industry "has presented" us with such productions which consequence in the beginning the person could not present itself yet. there were the cities-millionaires which growth it is impossible to stop. all is result of great inventions and gains of the person.the basic polluting substances.basically there are three basic sources of pollution of atmosphere: the industry, household boiler-houses, transport. the share of each of these sources in general, air pollution strongly differs depending on a place. now that most strongly pollutes air industrial production. sources of pollution - thermal power stations which together with a smoke throw out sulphurous and carbonic gas in air; the metallurgical enterprises, especially nonferrous metallurgy which throw out in air оксиды nitrogen, hydrogen sulphide, chlorine, fluorine, ammonia, connections of phosphorus, a particle and connection of mercury and arsenic; chemical and cement works. harmful gases get to air as a result of burning of fuel for needs of the industry, heating of dwellings, work of transport, burning and processing household and industrial wastes.