Explain the words in bold from the text and make up sentences of your own. Use English-English dictionaries to help you

3. Suggest the Russian equivalents:

silica, man-made glass, stone beads, appropriate mould, potash, subsequent deterioration, copper, tin, decolouriser, a non-sheet product, rectangular and circular blocks, float glass, antique appearance, invisible hard coating, ultra-violet light, to wash the surface, unsightly streaks or spots, clear or tinted float glass, the required level of solar transmission.

4. Give the English equivalents:

gечь; прозрачность; придавать форму; изнашивание; стекло; отжиг; потребитель; реставрация; эмаль; пятно; застекление; примесь; марганец; сурьма; полый сосуд; кварц; стеклянный блок; прямоугольный; стойкий к истиранию; содержание извести; придавать форму; рисунок; медь; олово.

5. Read the text again and answer the questions that follow (1-6):

1. What is the definition of the word “glass”?

2. What components is glass made of?

3. What is the manufacturing process of glass blocks?

4. How was the medieval glass produced?

5. What is the role of metallic compounds in glass manufacturing?

6. What new information have you known about self-cleaning glass?

6 Match the information given to the paragraphs in the text: