Текст: The simplest hydraulic system is perhaps the hydraulic shock absorber which consists of a pump (piston) and resistance. Another elementary type of system is the hydraulic weighing machine, which consists of a non-continuous pump element(piston or diaphragm) and a pressure gauge.
Other elementary systems consists of a jack, transmission line, and a pump of the non-continuous type without control gear, although valves may still be present for secondary purposes. Systems of this type are used for remote transmission of manual or pedal effort or motion, or for remote transmission of instrument indication.
The simplest best known system of this type hydraulic brake.

1. The pupils discussed) this problem yesterday .2. The pupils were discussing this problem the whole evening yesterday. 3. They (were discussing this problem from three till five o'clock. 4. They were discussing this problem at four o'clock yesterday. 5. They were discussing this problem when I came in. 6. She learnt a poem yesterday. 7. She was learning a poem at five o'clock yesterday. 8. She was learning a poem from five till six o'clock yesterday. 9. She was learning a poem when mother opened the door. 10. She was learning a poem the whole day yesterday. 11.1 did not see) him yesterday. I saw him two days ago. 12. She was not writing a letter at seven o'clock yesterday. She  wrote) it two days ago. 13. Jane was reading the magazine from five till six o'clock last evening. 14. He studied a rule in the morning last Monday. 15. Last month our team lost the game. 16. What was she  doing when the telephone rang? 17. Whom were they  speaking to when I met them at the station? 18. They were having lunch when the telephone rang. 19. Nick was making a report at three o'clock yesterday. 20. Mike was writing on the blackboard when I came into the classroom. 21. She was not sleeping the whole night yesterday. 22. Who entered the room when you were watching television? 23. What were you  thinking about when I asked you a question?

In the pencil case .

There are pens in the pencil case.

There are many books on the table.

The briefcase contained books notebooks and 2 apples.

The room has a table, chair. bed..

The table has an eraser and pencil case.

There are a lot of fish in this lake.

In the castle of the Prince.

There are apples and oranges in the bag.

There's water in the bucket.

There are 15 girls and 16 boys in our class .

There are many theaters and cinemas in our city.

There were modern paintings and photographs of the family on the wall.

There was an old soccer ball under the bed.

Near our house there are shops and a gym.

Behind the sofa was an old bag and some papers.

Between the houses was a small area with swings

Behind my house there is a forest and a pond (a pond)

There are many different birds in our forest.

The basket contained apples, pears,plums)

1 near the door Bicycle.

2 children In the Park.

3 there is a postman In the house.

4 there are postmen In the house.

5 on the wall of the shelf.

6 there is a sofa In the corner of the room. ( in the corner of )

7 there is a table in the center of the room.

8 in the left corner is a wardrobe.

9 there are a lot of animals In our zoo.

10 there is no pencil case In the bag.

11 there is a new carpet On the floor.

12 there are many books On the shelf.

13 on the table lay a magazine and many different books .

14 there is no milk In the refrigerator.

15 is my book On the table?

16 there are no sweets In the box.

17 kittens In the box?

18 is My textbook on the shelf?

19 Letter in the mailbox?

20 there's a Bicycle At the door? ( at the door )

21 are there bananas In the basket?

22 there are no books In my bag.

23 there are a lot of unnecessary things In the closet.

24 there is no phone in my pocket.

25 there was no one In the house.

26 there is no phone On the table.

27 Phone is not on the table.

28 is there a picture On the wall?

29 Ruler in the pencil case