Переведите in the 19th century many people got sick and died after they had operations because of infection. but doctors didn't know about it. that is why they didn't wear special clothes during operations didn't always wash their hands or clean their instruments. a british doctor, joseph lister, knew that infection was caused by germs.in his hospital doctors started to wear special white clothes.they regularly washed their hands and cleaned their instruments before and after operations. it saved many sick people in the hospital. in 1928 a british scientist alexander fleming worked in his laboratory at st mary's medical school. with the help of his microscope he studied some green mould and saw that it killed the germs, which were near it. it was a very important discovery which fleming called peni- cillin, it was the first medicine against infection. but it was too expencive to make. in 1941 henry florey and ernst chain from oxford found a cheaper way to make the medicine and it saved millions of people. in 1945 the three men got a nobel prize for their work.

В 19 веке много людей были больными и многие из них погибали после операций из за инфекций. Но доктора не знали об этом. По этому они не одевали специальную одежду во время операций и не всегда мыли руки и инструменты. Британский доктор, Джозеф Листер, знал что инфекции вызывают микробы. Доктора в его больнице всегда носили белую и чистую одежду. Они регулярно мыли руки и обрабатывали инструменты до и после операций. Они многих больных. В 1928 году Британский ученый Александр Флеминг работал в его лаборатории  в мед. университете Святой Марии. С микроскопа он обнаружил некую зелёную плесень и заметил что находящиеся рядом  микробы погибли. 
Это было очень важное открытие, которое Флеминг назвал пенициллин, это был первый антисептик. Но он был слишком дорог в производстве.В 1941 году Генри Ф. и Ернст Ч. из Оксфорда нашли создания дешёвого антисептика который миллионы жизней. В 1945 году 3 человек получили Нобелевскую Премию за их  работы. (Простите за долгое время написания)
  

LILY. The white lily stands for purity. LILY is the family name of about 2,000 species of plants. Most are herbs (plants without woody stems). The family includes onion, asparagus, tulip, and hyacinth. The name comes from a group of perennials of the genus Lilium, often called the true lilies. Of the 80 or 90 species known, about 24 are natives of North America, about 50 are Asian, and 12 are European. True lilies have underground bulbs made of overlapping scales which contain stored food. Their flowers (except for rare double forms) have three sepals and three petals so nearly alike that all six often are called petals. The blossoms grow at the top of a leafy stalk. They are of many colors and shapes. Among the most beautiful are the white Madonna (Easter) lily; the Japanese Turk’s-cap with orange flowers spotted with red; the clustered dark-orange, purplish-spotted tiger lily; the scarlet coral lily; the gold-banded lily of Japan; and the pink Speciosum lily.

1. Who did you see at the meeting yesterday?

2. Robert and Tricia have known each other for over 25 years.

3. Stop talking! I am learning my lessons.

4. I have already finished my homework.

5. I am sure you will enjoy this book, it’s really interesting.

6. How long had she been working there when you met her?

7. Was Mr. Dawson in Detroit yesterday?

8. I met Jim a couple of days ago.

9. He is the most stupid man I have ever met.

10. How long ago did they leave?

11. I am going to the theater tonight; I bought the ticket yesterday.

12. They spent their summer holidays in Italy when they were children.

13. How long had they been runnung before it started to rain?

14. I was sleeping when he rang me last night.

15. I have never changed a tire before.

16. She will have finished her homework by 5 o’clock. или She had finished her homework by 5 o’clock.

17. While I was going to work I met an old friend of mine.

18. Jill has had a car for a week.

19. How long have they been learning English?

20. They will probably come to our party.  

21. When I got home, they had already had dinner.

22. I am sweating because I am cleaning the whole house.

23. -Is the house clean?

-Yes, I have cleaned it.

24. He was playing with matches when he burnt himself.

25. The plane has just landed.

26. Bob doesn't like dancing.

27. Bob has never liked dancing.

28. John F. Kennedy died in 1963.

29. That was the worst film I have ever seen.

30. My family has owned the castle for over two centuries.

31. I have been waiting for you for three hours.

32. Henry talked/had talked to Sam two hours before. (Предложение неполное или с ошибкой?)

33. Yesterday I met Dan; I hadn't seen him for ages.

34. We will go on a school trip next Tuesday.

35. I promise I won't tell lies anymore.