Falling on March 20 every year, the International Day of Happiness     1     people how important it is to stay happy. But what is happiness and what can we do to be happy?

A famous researcher Sonja Lyubomirsky describes happiness as the     2     of joy and contentment (满足) together with a sense that one’s life is     3    .

People’s happiness is     4     by both how they think and feel inside, and by things that happen around them,     5     the writers of the book Culture and Psychology. Some other key factors (因素) are a person’s personality, social relationships and ability to meet their basic needs.

We have     1     seasons in a year: spring, summer, autumn and winter. Zip likes spring     2    . He thinks it’s beautiful. The     3     are green. There     4     beautiful flowers everywhere. Sarah’s favorite season is summer because of     5     Day and the summer vacation. She can go     6     in summer. Amy’s class like autumn. The colors are beautiful and the weather is good.     7     have a school trip in autumn. Zoom likes winter. He     8     sleeps all day. He likes     9     days, too. He often     10     with his friends.