I’ve spent years studying happiness and one of the most significant (1) ... (CONCLUDE) is that there is hardly any correlation between the circumstances of people’s lives and how happy they are. A moment’s reflection should make this obvious. We all know people who have a (2) ... (RELATE) easy life, yet are always miserable, and others who have suffered many (3) ... (HARD) but remain essentially happy. The first secret is gratitude. Ungrateful people cannot be happy. We have a tendency to think that being unhappy (4) ... (ABLE) people to complain. It is truer to say that finding cause for complaining leads to people becoming unhappy. The second secret is the realisation that happiness is a by-product of activities that give our lives meaning