For questions 9-16, read the text below and think of the word which best fits each gap. Use only one word in each gap. There is an example at the beginning (0). In the exam, write your answers IN CAPITAL LETTERS on tho separate answer sheet.
We still tend 0 _____ think chewing gum is a fairly recent invention, even 9 there is evidence it was used 5,000 years ago in Finland. The Ancient Greeks also chewed gum, as 10 the Aztecs in Mexico during the sixteenth century. As far as we know, however, it wasn’t 11 1869 that chewing gum became popular in its present form, 12 a New York inventor called Thomas Adams first had the idea of adding flavour to it.
Nowadays, of course, it is chewed around the world, 13 the fact that it continues to be regarded by some 14 an unpleasant habit. Unfortunately, far too many people drop used gum onto the pavement, 15 it remains for some time because it is extremely difficult to remove once it has stuck to the surface. On the other hand, those 16 favour of chewing gum claim it helps them relax, improves their concentration, and helps keep their teeth clean.