How do you measure happiness? Perhaps health is the best way because a famous doctor once said. "Happy people generally don't get sick." It’s aLso 13_____________to measure how many people feel ill or unhealthy in a country. For example, one survey says Iceland is the "healthiest country in the world" because men and women live a long time there, the air is very 14_____________ and there are more doctors available per person than anywhere 15_____________ in the world.

However, there was another survey of the happiest countries in the world and Iceland was not 16_____________ the top. The questions on this survey 17____________: How much do you earn? How healthy are you? How safe do you feel? After visiting 155 different countries, the researchers 18___________that Denmark feels happier than other countries.