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In modern times bricks can be made of concrete, mortar, of burnt clay and of a combination of some other substances. 1 _______. Accordingly, bricks produced nowadays have different sizes, shapes, colours, and textures. 2 _______. It should be noted that some types of brick, such as, for example, salmon bricks are underburnt and highly porous. 3 _______. This property of salmon brick should be taken into account when choosing brick material for construction. But there exist many other types of brick that are extremely strong and almost glass hard. 4 _______. Brick properties are of great importance and should be taken into account while choosing material for construction purposes.