Английский язык . Помогите, пожалуйста с решением

Read the text and choose the correct word, A, B, C or D, for each space. There is an example at the beginning (0).
How to be happier
Our happiness doesn’t depend only (0)… A… what we have, say scientists. What we (1) ... we have is just as important. This is why the rich often seem miserable but people with very little (2) ... be much happier with their lives.
It is (3) … how rarely we think about how lucky we are. Most of us have good health, homes and friends. We don't notice how good life normally is until we're feeling sad (4) … something. But we don't (5) ... to wait for something negative to happen.
Instead, we (6) … be grateful all the time for the good things in our lives. We can do this by writing down five of them (7) ... night. For example, something that we own, or the people we are fond (8) … . By repeating this every day for a month it will become a (9) … . People who do this are healthier, more successful and more satisfied (10) … their own lives.