For questions 17-24, read the text below. Use the word given in capitals at the end of some of the lines to form a word that fits in the gap in the same line. There is an example at the beginning (0). In the exam, write your answers IN CAPITAL LETTERS on the separate answer sheet.
According to experts, doing puzzles keeps our brains fit and 0 _____As well as gaining 17 from finding the correct answerto a difficult problem, we give our brains a good workout in the process. To help us do this, all sorts of handheld ‘brain games’ are now available in the shops, and the most 18 gameshave sold in their millions.
What’s more, people 19 that the more they play the games, the easier it is to find a 20 to the problemsposed. They see this as proof that there has been an 21 in the power of their brains. Unfortunately, however, this may be a false impression.
Some 22 argue that the brain gets better at any taskthe more often it is repeated. In other words, the improvement in the 23 of the brain is something that happens naturally.So although these brain games are obviously fun to play, it remains 24 whether they are actually helping to boost brainpower or not.