Замените действительный залог страдательным.1.a postman collects the mail twice a day.2.millions of people are watching this tv programmer.3.they were talking about that problem the whole evening.

What is ecology? This word comes from the Greek word  which means "house". So this word means scientific study of the relationships that living organisms  have with each other and with their environment. Nowadays we speak about ecological problems, because of the technology. There are too many machines which pollute the air, water and ground. Fishes cannot live in dirty water. birds cannot fly in dirty sky. trees are cut. Animals cannot live in forests without trees . People breath dirty air, eat unhealhy food and have many deseases. That is ecology. Scientists make their best to improve this situation. They are called ecologists. Many voluntary groups such as Greenpeace try to help our planet.

Dear friend,

Thanks for your letter. It was so nice to hear from you. I am sorry I haven’t written for a long time but I was busy with my project at school.  

In your letter, you ask me about books. The last book that I read was a detective novel. My sister recommended it because she enjoyed it a lot. As for me, the most interesting literary genres are science fiction and detective stories. The former one is very informative and useful. The latter is captivating and extremely interesting to read. Nonetheless, reading is not the only thing that you can do on holidays. So not to get bored you may also hang out with your friends, walk around the town, etc. Enjoy yourself and have fun!

Write back soon.

Best wishes,

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