при разложении карбоната магния массой 33,6 г получено 7,2 л углекислого газа н.у .Определите выход реакции %

Помогите мне написать 5-7 предложений про погоду на английском языке.

Даю много пунктов, лучшее решение и благодарение ;)

Упр. 209. Раскройте скобки, употребляя глаголы в Present Perfect или Past Simple. 1. The sun (not to rise) yet, but the sky in the east is getting lighter every minute. 2. I (to see) you walking along the street the other day with a heavy bag. 3. I (not to read) the newspaper today. 4. It is very late, and trams (to stop) running: we must find a taxi to get home. 5. How many times you (to be) to St. Petersburg? 6. At last I (to translate) this article: now I shall have a little rest. 7. We (to go) to the country yesterday, but the rain (to spoil) all the pleasure. 8. My watch was going in the morning, but now it (to stop). 9. The lecture (not yet to begin) and the students are talking in the classroom. 10. She just (to go) out. 11. She (to leave) the room a moment ago. 12. We (not yet to solve) the problem. 13. When it all (to happen)? 14. The morning was cold and rainy, but since ten o'clock the weather (to change) and now the sun is shining brightly. 15. Show me the dress which you (to make). 16. Oh, how dark it is! A large black cloud (to cover) the sky. I think it will start raining in a few minutes. 17. Oh, close the window! Look, all my papers (to fall) on the floor because of the wind. 18. When you (to open) the window? — I (to open) it ten minutes ago.

раставьте знаки препинания. Так начинает Волга самая большая река в Европе свой далекий путь.