Вопрос № 912012 - Английский язык

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Nowadays suspended ceilings have become a very popular and economical feature in many types of buildings. The most numerous among these buildings are office and laboratory structures. Many of them install and maintain complex mechanical and electrical installations above the ceiling. These installations include air conditioning ducts, water and waste piping and electrical and communications wiring. They also include such services as fume ducting, vacuum piping, fuel gas lines, compressed air lines, water piping, and chemical waste piping. All these ducts and pipes occupy a considerable space in the building. In some of them they may be equal to the amount of their living space.  
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All these ducts and pipes _______.

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Suspended plaster ceilings have been in use already for several decades. 1_______. Suspended ceiling is a finish ceiling. 2_______. Among them the most widely used are gypsum, board, plaster, and various boards made of fibers. 3_______. Ceilings produced of fibrous materials are classified as acoustical ceilings. 4_______.

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Being the oldest building material, wood is also known to be the only naturally growing organic material. 1_______? Hardly so, because wood always contains some water which decreases its strength. 2_______. It is a well-known fact that the drier is the cut wood the greater is its strength and hardness.
Trees are known to grow naturally, which makes wood a constantly renewable natural resource. 3_______. But, as any other construction material, wood has its disadvantages. The main ones are the following – it is not fire-resistant, it easily burns. 4_______.

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This is a workshop. 1_______. Many tools are on the toolboard. 2_______. A safety-notice is above the toolboard. 3_______. There are many nuts, nails, screws on the shelf. 4_______. A hammer is not on the shelf, it is on the bench. A switch is between the bench and the shelf.

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The traditional frame material for windows is wood. 1_______. Wood is known to be a good thermal insulator and is extremely workable. It is easily turned into sashes.2_______. That is why wood elements require repainting every few years. 3_______. Besides, it requires no periodic repainting. 4_______. Aluminum also has its disadvantages. It is known to conduct heat so well that very soon condensation will form and even frost on interior window frame surface during cold winter weather.

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It is a well-known fact that every roof should have a covering. 1_______. The pitched roof is known to dry itself quickly of water. Therefore it can be covered with roofing materials consisting of small individual units. 2_______. These materials are widely used and popular as roofing coverings since they have a number of useful qualities. 3_______. Secondly, they are easy to repair since they are individual and small. 4_______. So if a pitched roof is manufactured of properly chosen material and is well installed, it looks beautiful and attractive.