Расположите пропущенные предложения в таком порядке чтобы получился связный текст. Sheet metal formi...: ответ на тест 1046601 - Английский язык

Расположите пропущенные предложения в таком порядке, чтобы получился связный текст.
Sheet metal forming is widely used when parts of certain shape and size are needed. 1_______. One characteristic of sheet metal forming is that the thickness of the sheet changes little in processing. The metal is stretched just beyond its yield point (2 to 4 percent strain) in order to retain the new shape. 2_______. Shearing is a cutting operation similar to that used for cloth.
3_______. For example, to make the roof of an automobile from a flat sheet, the edges are gripped and the piece pulled in tension over a lower die. 4_______. And finally the edges are sheared off to give the final dimensions.

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1___________. There are two types: metal alloys and plastic polymers. The metal alloys were made first and they are usually an expensive mixture of titanium and nickel.
2_______:
- plastics that return to their original shape when the temperature changes.
One use is in surgery where plastic threads ‘remember’ the shape of a knot, react to the patient’s body temperature and make themselves into stitches.
- metal alloys  that have a ‘memory’ and can return to their original shape.
 3____________. The implant then expands back to its original shape.
- 4___________.

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1_______. This system was first developed in India in the 3rd century BC. 2_______.
The important innovation in the Arabic system was the use of positional notation, in which individual number symbols assume different values according to their position in the written numeral. 3_______. The symbol 0 makes it possible to differentiate between 11, 101, and 1,001 without the use of additional symbols, and all numbers can be expressed in terms of ten symbols, the numerals from 1 to 9 plus 0. 4_______.

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Soldering is recommended for making connections on electrical circuits, but it should never be used where strong joints are required. For permanent joints between two dissimilar materials like nylon and metal, it is advisable to use adhesives. For temporary jobs, like fitting a maintenance cover, screw-fastening should always be used. Riveting is recommended for permanent sheet-metal joints such as outer casing fitting. Although welding should always be used for steel support girders, brazing can be used for medium-sized joints where strength is required; for example the joint between the base and body of a hydraulic jack.
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Screw-fastening should always be used for …

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Cast iron should be used for components which must be strong in compression. It is recommended for machine beds and frames. Wrought iron is recommended for components where tensile strength is required; for example, crane hooks and railway couplings. Mild steel should be used for components which must be strong in shear; therefore it is recommended for rivets and bolts. Medium carbon steel is recommended for components where impact strength is required; for example, axles and hammer heads.
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Wrought iron is recommended for …

Заполните пропуски в инструкции следующими словами:
1) Never run along the 1_______.
2) Safety boots must always be worn on 2_______.
3) Always use safety 3_______ in the workshop.
4) You must worn 4_______ at heights.