When we offer our best wishes to others, we say: “May you be happy every day”. But there are always things that prevent people from feeling happy.
First, perhaps the biggest is genetics（遗传学）. Some scientists say that some people are 1 happier than others. Besides, 2 life events as well as social and economic factors can also 3 in the way of happiness. Third, there’s 4 affecting your happiness, for diseases, if any, bring you trouble and pain.
Is it possible that people can find 5 happiness with so many factors preventing them? Positive psychologists believe it’s 6 for people to stay happy for long periods, although it cannot be lasting. Psychologists argue that day-to-day happiness 7 on pleasures and gratifications (满足).
