It must have been invented by...
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When and where do you think there were invented? brain surgery, concrete, eye make-up, water sanitation systems Read the text and check your predictions Which information did you find the most surprising? How certain is it that the sentences are true? Write certainly true (CT), possibly true (PT) or certainly not true (NT). 1 Egyptians invented make-up. 2 Both men and women in ancient Egypt wore make-up. 3. Our ancestors knew about bacteria. 4. It was a bad idea to perform brain surgery. 5. Roman concrete was good as modern concrete. 6. Roman concrete was very strong. 7 The people in the Indus valley were safe from dangerous diseases. Find the sentences in the text that told you the answers to Exercise 3. Match the modal structures with their meaning (1-4). Then read the Grammar box to check. 1 It's very probable or certain that something happened 2 It's quite possible that something happened. 3 It's imp...