Part 3. For questions 46-50, identify 5 mistakes in the following passage and correct them. Write your answers in the corresponding numbered boxes on your answer sheet.

It is a well-known fact that Japanese people have a longer life expectancy than the population

of most other countries. A recent report shows that the Japanese also expect to remain healthier for longer. Scientists are trying to work out which keeps elderly Japanese people so healthy, and whether there is a lesson from which we benefit. Should we make any changes to our eating habits, for instance, or go jogging each day before breakfast? Is there some secret ingredient in the Japanese diet that is particularly beneficial for the human body? Because the prospect of a longer, healthier life is a good thing for the individual, it can create a social problem.

A number of people over the age of 65 in the population has doubled in the last 50 years and that has increased pension and medical costs. Japan could soon be encountered an economic

problem: there are more elderly people who need to be looked after and relatively fewer younger people working and pay taxes to support them. One solution could be to raise retirement age from 65 to 70. After all, the elderly have a great deal to contribute. If they continue to be active in society, younger generations will have the chance to learn their wisdom from experience.

Scientists are trying to work out which keeps elderly Japanese people so healthy,