С.яз. 55 б. 1.passive voice 1)the postman will leave my letter by the door. 2)they have been sent to your address. 3)tchaikovsky composed the music for sleeping beauty. 2.phrasal verbs & dependant prepositions. 1) i'm terribly sorry! i mistook you _ someone else. 2) could you turn _ the lights, please? it's very dark in here. 3) i was impressed _ the movie.

1 My letter will be left by the postman by the door.
2 They have been sent to your address.
3 The music for Sleeping Beauty was composed by Tchaikovsky.

1 I'm terribly sorry! I mistook you for someone else.
2 Could you turn on the lights, please? It's very dark in here.
3 I was impressed with the movie.

-What do you know about the Environmental Pollution?
-People have always polluted their surroundings. But until now pollution was not such a serious problem.
-You don't say so! What do you mean?
-In past most people lived in uncrowded rural areas and didn’t have pollution-causing machines. But with the development of crowded industrial cities the problem of pollution has become more important.
-And what causes the pollution to your mind?
-Using automobiles and other machines made pollution steadily worse. 
-Oh, I absolutely agree. But can the pollution cause any health problems? What do you think?
-Sure! Polluted air can cause illness, and even death. Polluted water kills fish and other marine life. On polluted soil, food products can’t be grown.
-Oh, I have never thought that it can be that bad!
-Yes, and moreover environmental pollution spoils the natural beauty of our planet.
-I see, but what can people do to reduce the pollution?
-Well, it's not a secret, but people would have to stop using many useful things if they wanted to end pollution immediately. Most people don’t agree to do that.
-Well, this is clear, but can we do anything now to help our planet?
-Scientists and engineers can find the ways to reduce pollution from automobiles and factories. Government can pass the laws that would make enterprises take measures for reducing of pollution. Individuals and groups of people can work together to persuade enterprises to stop polluting environment.
-Oh, thank you very much! Your advice is of great help!

1)  Pollution was not such a serious problem before, bacause people used to live in uncrowded rural areas and didn't have as many machines, as they have now.
2) People have bacome alarmed with the danger of pollution since the late 1960′s.
3) Environmental pollution can cause extinction of different plants- and animal species, illness, and even death.
4)  Pollution is a very complicated problem because all the things that contribute to pollution are a necessary part of the modern world. The today's mankind can't simply imagine living without cars and factories. (However, this text must have been a way too old, most of the first-world countries are pretty much capable to deal with their ecological situation, that includes making energy of waste, etc.)
5) Pollution can't be stopped immediately, because people would have to stop using many useful things.
6)  Government can pass the laws that would conduce to reducing of pollution. Individuals and groups of people can work together to persuade enterprises to stop polluting activities. 

а теперь мои вопросы:
1) Если у Вас есть перевод, в чём проблема ответить на эти вопросы? Там же метод Ctrl+c, ctrl+v.
2) Если Вы хотите, чтобы на вопросы ответил кто-то другой, то зачем предоставлять перевод? Задача от этого не становится ни легче, ни сложнее.