Read  the  following  passage  and  mark  the  letter  A,  B,  C  or  D  on  your  answer  sheet  to  indicate  the correct word for each of the blanks. In  recent  years,  there  has  been  a  remarkable  increase  in  research  into  happiness.  The  researchers have (71) ............ a number of factors which contribute to a definition of happiness. First  of  all,  there  is,  in  some  people,  a  moderate  genetic  predisposition  to  be  happy,  in  other  words, happiness (72) ............ in families. And happiness seems to correlate quite strongly with the main dimensions of personalities: extroverts are generally happier, neurotics are less so. Second,  people  often (73)  ............ good social  relations  as  a  reason for their  happiness. In  particular, friends  are  a  great (74)  ............  of  joy,  partly  because  of  the  agreeable  things  they  do  together,  partly because  of  the  way  friends  use  positive  non-verbal  signals  such  as  caressing  and  touching,  to  affirm  their friendship. Marriage and similar (75) ............relationships can also form the basis of lasting happiness. Third,  job  satisfaction  undoubtedly (76)  ............  overall  satisfaction,  and  vice  versa  –  perhaps  this  is why  some  people  are  happy  in  boring  jobs:  it  works  in  both  ways.  Job  satisfaction  is  caused  not  only  by  the essential  nature  of the  work,  but  also  by  social  interactions  with  co-workers.  Unemployment,  on the  contrary, can be a serious cause of unhappiness. Fourth, leisure is important because it is more under individual (77)............than most other causes of happiness.  Activities (78)  ............  sport  and  music,  and participation  in  voluntary  work  and  social  clubs  of various  kinds,  can  give  great  joy.  This  is  partly  because  of  the (79)  ............  themselves,  but  also  because  of the social support of other group members – it is very strong (80)............ the case of religious groups. Trả lời câu hỏi dưới đây:______(80)