1) At that time, when I'm 25, people will have a good education
2) By the time when I will be 25, the Earth will be contaminated
3) While we do not pollute the planet, our people will not have problems.
первое- While the people in our cities will not litter, they will not do harm the planet.
второе- While the people in our cities, they have to worry about the cleanliness of the city and the planet.
Until very dirty should not walk, so we will take care of the planet and the city to monitor the purity
Я думаю,что,нужно так)
How are you? I’m fine but I’ve been really busy lately! I thought I’d just write and tell you all about the wonderful day I had last autumn. I went to the Town of stones in Alexandrovsk with my friends. There are a lot of stones – big and small. Also there are trees with colorful leaves. It's very beautiful! There are no rules! You can do what you want! In Town of stones we climbed huge stones and high trees - it was fascinating! We have brought many photos from there. In photos there are beautiful landscapes and tiny little men - are we! We played at Hide-and-Seek. It was very cheerful! To the end we were exhausted and hungry - after that all food was so delicious! And it was very pleasant to have a rest! We had a really amazing day! I would like visiting it again! Have to go now, Alyona .