Sentences 8-15 are past

1. (the office/clean/yesterday) The office was cleaned yesterday.

2. (the/fundamental/chemical/reaction/explain/by/the scientist/during/his last experiment) The fundamental chemical..................................................................

3. (three people/injure/in the accident)...............................................................................

4. (my bicycle/steal/a few days ago)......................................................................................

5. (when/this bridge/build?).....................................................................................................

6. (the elements/of the Periodic Table/arrange/according to/their atomic weights?)........................................................................................................................................

7. (how/these windows/break?)..............................................................................................

8. (I/not/wake up/by the noise)..............................................................................................

Exercise 25: Put the following sentences into interrogative form:

1. English is spoken all over the world.

2. It is considered that the life developed in the waters of the earth.

3. pH is measure on the scale that is different from other instrument scales.

4. The boiling points of this compounds are known to gradate regularly.

5. These shoes were made in Italy.

6. America was discovered many centuries ago.

7. The first instrument for measuring temperatures was invented by Celsius.

8. This house was built by Mike in 1993.

9. The laboratory is well ventilated because chemists often work with substances having strong and unpleasant odour.

10. This novel was written by Charles Dickens.

11. Water is composed of one atom of Oxygen and two atoms of Hydrogen.

12. They are sure that some way out of this difficult situation will be found.

13. Different medicinal plants were planted by the students of our Academy in the experimental botanical garden.

14. The office rules were explained to the staff by the manager.

15. Morphine was isolated from opium by Serturner in 1806.

Exercise 26: Put the verb into the correct form, present simple or past simple, active or passive:

1. It’s a big chemical plant. 500 people (employ) there.

2. D.I. Mendeleyev (devote) all his life to the development of chemistry.

3. Most of the Earth’s surface (cover) by water.

4. The company is not independent. It (own) by a much larger company.

5. The letter (post) a week ago and it (arrive) only yesterday.

6. Water can (separate) from the dissolved substances by distillation.

7. Everybody (know) the Periodic law.

8. While I was on holiday, my camera (steal) from my hotel room.

9. While I was on holiday, may camera (disappear) from my hotel room.

10. Chemistry’s origin (go back) to ancient times.

11. The first instrument for measuring temperatures (invent) by Celsius.

12. Water (boil) at the temperature of 100°C.

13. My friend (admit) to the University last year.

14. The exact amount of water in the human body (depend) on a person’s аge, sex and build.

15. My friend often (receive) letters from his grandparents.

Exercise 27: Correct the sentences if there are any mistakes:

1. This house built 100 years ago. This house was built 100 years ago.

2. Celsius divided the interval between the boiling point and the freezing point into 100 divisions.......................................................................................................................

3. Why did the letter send to the wrong address?.............................................................

4. The Water Cycle is the journey water takes as it is circulated from the land to the sky and back again. …...................................................................................................

5. Where are you born?.................................................................................................................

6. Water call one of the most remarkable compound in the world. …....................

7. When was invented the bicycle?..........................................................................................

8. Chemical formulas are written in terms of atom and molecules...........................

9. How many languages are speaking in Switzerland?....................................................

10. During the next chemical reaction the number of bonds will be formed or broken.............................................................................................................................................

11. Football plays in most countries of the world.............................................................

12. A cinema is a place where films are shown..................................................................

13. The laws of the Periodic table is specified that water shall solidify at a temperature of 100° below 0................................................................................................

14. A garage is a place where cars repair..............................................................................

15. The water can be absorbed from the ground by the roots of the plants..........

Exercise 28: Translate sentences of the interview from Russian into English:

- The topic of your scientific research is water and its protection. So, can you explain what people all over the world are worried about?

- Да, конечно, могу. Прежде всего, следует отметить, что люди во всем мире обеспокоены состоянием окружающей среды. Многочисленные газеты и журналы пишут о загрязнении земли, воздуха и, конечно же, воды.

- Can you compare the living conditions of nowadays and of the past? What is the difference?

- Сравнение имеющихся в настоящее время данных с данными, полученными несколько лет назад, выявило значительные различия в условиях существования. Много лет назад люди жили в гармонии с природой. Промышленность в то время была еще не очень развита.

- You are absolutely right! Nowadays people live in big industrial cities with smoky plants and enterprises. The by-products of these companies pollute air, water and land. But what happens, when the wastes get into water?

- Это очень серьезная проблема. Моря, реки и озера – в опасности. Они наполнены ядовитыми веществами: промышленными отходами, химическими удобрениями и пестицидами. В результате этого, многие образцы рыб и водных растений вымирают.

- What can we all do?

- -Мы должны заботиться о Земле для нас самих и для последующих поколений. Мы должны сделать все возможное, чтобы сохранить не только воду, но и землю, и воздух чистыми.

Exercise 29: Read and translate the text: