填空题 Translate the underlined parts into Chinese．(南京大学2011研，考试科目：基础英语) Research shows kindness can also make us happier. Professor Sonja Lyubomirsky from the University of California asked participants in a study to perform random acts of kindness over ten weeks. She found happiness increased over the study period, although there was a catch: (1) People who performed a wide variety of kind acts—holding the door open for a stranger, doing a flatmate"s dishes—reported much higher levels of happiness, even one month after the study ended, than people who performed one act of kindness repeatedly. (2) It makes no difference to your happiness if you help a loved one or a stranger, but it may have different results. (3) "A small, anonymous act might make you feel like a very good person. But a big act of kindness towards someone you know may have social consequences: you might meet a new friend, or be generously thanked, " says Professor Lyubomirsky. So paying for a stranger"s coffee may give you a temporary buzz, but helping an elderly neighbour to shop may help you forge a better relationship. Kindness is good for you in other ways. Professor Stephen Post, author of Why Good Things Happen to Good People, has examined the evidence that being kind is good for your health. (4) A study of 2, 016 church members found those who regularly helped others had better mental health and lower rates of depression. (5) Other studies found helpful people were less likely to fall ill from chronic disease, and tended to have better immune systems. " A strong correlation exists between the wellbeing, happiness and health of people who are kind, " says Post.