Нужно правильно перевести модальные глаголы в скобках исходя из ситуации. у меня вышло почти везде should,подозрительно. хочу проверить.ex. 8. translate the words in brackets. 1. he (пришлось) take the documents to the police station. 2. you (должны) tryto find the mistake and correct it. 3. if you want to become a good football player you (должны) be an all round athlete. 4. i (вынужден был) read the letter twice before i understood it. 5.when (должны) they dock? have they written? 6. you (должны) think of others. 7.the lecture (должна) begin at 8 o’clock. 8. it has been arranged that she (должна) come and help the old lady. 9. itis necessary that you should do it. you simply (должны) do it. 10. if you (должен) meet mother at six, you must hurry.

1 had to

2 must

3 should

4 had to

5 must

6 must

7 should

8 should

9have to

10 have to

Ecology is the study that helps to preserve the earth, its plants and animals. it is also supposed to study the environment and the relationship between human activities and nature. until recently this relationship was in balance. however, at present times we have to face such ecological problems as acid rain, global warming, loss of rare species, ozone reduction, etc. many scientists think that it is connected with industrial boom and development of civilization in the world. building numerous factories people have started to interfere intensively in nature. every year world industry pollutes the atmosphere with tons of dust and other harmful things. as a result many species of animals and plants disappear forever, including fish and birds. many large cities suffer from factory smog. their activity pollutes the air, the water, the forests and the land. apart from factories there are lots of vehicles in the streets of every more or less developed city. it includes cars, motorbikes, buses, minivans, trucks and other types of transport which use fuel. first of all, they exhaust toxic gases into the air. secondly, they are considered to be the main noise offenders in the city. this problem progresses as the number of cars increases from year to year. as a result the level of harmful substances in the air also increases. another problem which is worth mentioning is the tree cutting. trees are a source of oxygen and clean air. so, by doing this people simply violate the biological balance. all the above mentioned ecological problems are the result of man’s careless interaction with nature. in my opinion, environmental protection should become of a global concern and serious measures should be taken to create ecological security.