Work in pairs.Match the words with their definition : 1.Concrete 2.Stairs 3.Clay 4.Brick 5.Landing 6.Railing 7.Staircase 8.To whitewash a.Type of earth that is soft when it is wet and hard when it is dry b.To paint walls white with a mixture of chalk and water c.Blocks of baked clay that are used for building walls d.A substance ased for building and made from cement , sand , small stones and water e.Balustrade f.A set of steps inside a building g.A set of stairs inside a building h.An area at the top of a staircase , with rooms leading off it