TEST 261The Official Cambridge Guide To IELTS · Questions 31–40Ceramics, Glass and ConcreteComplete the sentences below.Write NO MORE THAN TWO WORDS AND/OR A NUMBER for each answer.CeramicsCeramics date back approximately 31The first figurines were made in the area of 32Early humans could not use their pots to store 33The Chinese improved the quality of ceramics by mixing 34 with the clayChinese Porcelain was also called 35Bottger added quartz and 36 to clay to make porcelain.GlassGlass production is similar to clay ceramics apart from the rate of 37The Romans introduced the use of glass to make 38ConcreteThe discovery of concrete is probably due to observing reactions of water and 39The ability to build large 40 contributed to the success of the Roman Empire