Упр. 161. Раскройте скобки, употребляя глаголы в Present Continuous или в Present Simple. 1. I (not to drink) coffee now. I (to write) an English

Concrete is a composite building material made from the combination of aggregate ( composite ) and a binder such as cement. The most common form of concrete is Portland cement concrete, which consists of mineral aggregate ( generally gravel and sand ), Portland cement and water. It is commonly believed that concrete dries after mixing and placement. Actually, concrete does not solidify because water evaporates, but it is cement that hydrates, gluing the other components together and eventually creating a stone-like material. foundations, freeways, parking structures, bases for gates and fences, etc.
When used in the generic sense, this is the material referred to by the term concrete. As concrete has a rather low tensile strength, it is generally strengthened by using steel rods or bars ( known as rebars ). This strengthened concrete is then referred to as reinforced concrete. In order to minimize any air bubbles ( that would weaken the structure ), a vibrator is used to eliminate any air that has been entrained when the liquid concrete mix is poured around the ironwork.

postmark) at the post office.

3. The letters (to sort) into the different towns.

4. The mail (to load) into the train.

5. The mailbags (to unload) after their journey.

6. The bags (to take) to the post office.

7. The letters (to sort) into the different streets.

8. The letters (to deliver).

2) Раскройте скобки, употребляя глаголы в Present, Past или Future Simple Passive.

1. Bread (to eat) every day. 2. The letter (to receive) yesterday. 3. Nick (to send) to Moscow next week. 4. I (to ask) at the lesson yesterday. 5.I (to give) a very interesting book at the library last Friday. 6. Many houses (to build) in our town every year. 7. This work (to do) tomorrow. 8. This text (to translate) at the last lesson. 9. These trees (to plant) last autumn. 10. Many interesting games always (to play) at our PT lessons. 11. This bone (to give) to my dog tomorrow. 12. We (to invite) to a concert last Saturday. 13. My question (to answer) yesterday. 14. Hockey (to play) in winter. 15. Mushrooms (to gather) in autumn. 16. Many houses (to burn) during the Great Fire of London. 17. His new book (to finish) next year. 18. Flowers (to sell) in shops and in the streets. 19. St. Petersburg (to found) in 1703.

3) Передайте следующие предложения в Passive Voice, обращая внимание на место предлога.

E.g. We often speak about her. — She is often spoken about.

1. We thought about our friend all the time. 2. The doctor will operate on him in a week. 3. The teacher sent for the pupil's parents. 4. They looked for the newspaper everywhere. 5. Nobody slept in the bed. 6. The neighbour asked for the telegram. 7. Everybody listened to the lecturer with great attention. 8. The senior students laughed at the freshman. 9. The group spoke to the headmistress yesterday. 10. The young mothers looked after their babies with great care. 11. Nobody lived in that old house. 12. They sent for Jim and told him to prepare a report on that subject.