1. Our suppliers regularly change prices once a month basing on the currency exchange calculations.
2. Internet fraud increases in many European countries.
3. What does she do? - She is an executive secretary.
4. People usually demand higher salaries when inflation goes up.
5. I deal with with Sue’s clients while she is on vacation.
6. What are you doing? – I am sending the invoice details.
7. They operate in London, and now they are setting up new offices in Beijing.
8. Where do you work? – London this month, then Moscow the next.
9. This computer always breaks down.
10. Today managers need a new approach that relies more on communication and less on command.
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.
2)-He has just gone out
3)-I have seen it
4)-I have told him
5)-We have already done it
6)-I have not bought it yet
7)-Mary has been to Liverpool
8)-Ann has gone to Spain
9)-She has not come yet
10)-I have already read that book