Объяснение:
Thank you for your letter. Sorry I haven’t written for so long. I have been busy with my studies.
In your letter you asked me about sport. I can say that there are two extremely popular sports in Russia – dance and different kinds of fighting, for example, karate or boxing. Also I would add some winter sports, for instance, ice skating or hockey. As for sport facilities, we can play basketball and volleyball. All teenagers enjoy doing it. In my opinion, there are not enough competitions, it is only volleyball. I really want some another sport competition.
I have to go now. Write back soon.
1. The United Nations has (ООН в единственном числе) meetings where world leaders agree on what to do about global warming. If there is too much pollution in the air, some people have (conditional - как факт.Если будет 1-ое условие, то точно произойдет 2-ое) health problems.
2. Ecologists looked for special spots on white pine trees to know if there
were(согласование времен, множественное число) high levels of ozone.
3.Many types of air pollution are invisible, but some can be seen(пассивный залог) with the naked eye.
4. The teacher asked the boys if they had done(согласование времен в косвенной речи) the task.
5.Satellite images proved that deforestation had increased (согласование времен) rapidly.
6.The passage is so difficult that I can't (по смыслу) understand it.
7.Experts said that less than 3 per cent of the water on Earth was(согласование) fresh water.
8.His health has improved since he returned (грамматические правила) from the hills.
9.If we had sorted the waste, we would have saved (3 conditional) millions of kilowatts of energy.
2. If I see him tomorrow, I'll give him this book.
3. It rejoice, if we tell him about it.
4. We go to Paris next week, so we buy tickets now.
5 I hope that they will be home tomorrow.
6. When he call me? - He will call as soon as they have time.
7. Tomorrow my sister goes to the movies, if you buy tickets.
8. If you go shopping, buy me a coffee.
9. When she come to school, she will listen carefully to the teacher in the classroom.
10. They agree, if we invite them to the theater.