Прочитайте текст и заполните пропуски подходящими по смыслу словами. Plywood 1_______ materials are ...: ответ на тест 911999 - Английский язык

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Plywood siding materials are widely used in modern construction business. They are popular because of their light weight and their relative cheapness. The cost of the material per unit area of wall is usually less than for other siding materials. Besides, the labor costs are also relatively low. The reason for it is the fact that large sheets of plywood are more quickly installed than the boards of the same area. In many cases, if it is necessary, the sheathing can be eliminated from the building if plywood is used for siding. This operation, if it is performed, leads to further cost saving.
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What is the cost of the material per unit of the wall?

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Plywood siding materials are widely used in modern construction-business. They are popular because of their light weight and their relative cheapness. The cost of the material per unit area of wall is usually less than for other siding materials. Besides, labor costs are also relatively low. The reason for it is the fact that large sheets of plywood are more quickly installed than the boards of the same area. In many cases, if it is necessary, the sheathing can be eliminated from the building if plywood is used for siding. This operation, if it is performed, leads to further cost saving.
It should be taken into account that usually plywood sidings must be painted in order to save them for decay. But if they are produced from decay-resistant material, they can be left to weather effects without the surface coverage.

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Wood belongs to naturally growing 1_______. It is known to be the oldest construction material and is still widely used for different 2_______. Wood is popular since it has low 3_______ and is easy to work. Besides, it grows naturally and is cheap. But its 4_______ is limited because of its disadvantages: it easily burns and decays. As to stone, it also belongs to the oldest building materials. Among its disadvantages there are strength, high heat insulation and fire-resistance.

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Timber belongs to one of the oldest building materials. It has been from ancient times and is still produced from 1_______ wood. Timber has always been highly usable in construction because of its many advantages. To these belong its strength, light weight, cheapness, and high 2_______. Its other advantage is that it belongs to natural resources and is naturally renewable. It is the more so that about a third of the world is still considered to be covered with forests. Besides, timber is resistant to corrosion produced by 3_______ substances in the modern polluted atmosphere. One more advantage of timber is that it can be used for many construction 4_______.

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When did the first passenger train go through the Channel Tunnel?
The channel tunnel is between Britain and France. It is more than 20 kilometres long. It was built by British and French engineers. They started on opposite sites and met in the middle under the sea. They used specially-designed tunnel boring machines (TBMs) to dig the tunnels through the rock under the seabed. TBMs are enormous machines for digging tunnels. The machines used to dig the main tunnels were about 8.5 metres in diameter and 250 metres long. Work started in 1987 and the teams met under the seabed in 1991. The first passenger train went through in 1994.

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Why do light materials help create a lighter and brighter room?
Floors belong to one of the most important functional components of a building. Floors influence the acoustics of a room: it depends on whether a hard or soft flooring is used. Floors also react in various ways with light. Some flooring materials are known to produce mirrorlike reflection. As to dark flooring materials, they, on the contrary, absorb light and this absorption makes a room darker. As to light materials, they reflect light and help create a lighter and brighter room.