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Until I read the paragraph 12 to 16, I know the happiness relate with the gene[--(the) happiness relateS TO PEOPLE'S genes(or: GENETIC MAKEUP)]. The investigation shows that 50% of the difference among people’s happiness ratings is inherited.

But how about another(--THE OTHER) 50%[后加of people--but I don't think here the percetage refers to "people"; rather, it refers to one's feeling of happiness]. Close relationships also mark happy lives. A lot of people believe that the close relationships will give you happiness, but it’s not true. This[The(--"THE" may also be omitted)] close relationships always bring some stress to you. The other way round, having[去掉--can't be omitted] no close relationships may[--a verb is needed here] more[去掉] happier than them.

Anther[Another] thing effects[affects] the(--"the" should be omitted ) happiness is the(--"the" should be omitted ) marriage. For all (--"all" should be omitted )most people, the most significant alternative to aloneness is marriage. Everyone knows the marriage (-- "the" should be omitted ) will bring both happiness and distress to you. But the investigationshows(--"the" should be omitted , investigationS show)？ that married adults [--ARE ]happier than people who never married. Maybe it’s true. I believe the happiness(-- "the" should be omitted ) will come after the distress.

But how about the sex(-- "the" should be omitted )? I think it has no relation with the (-- "the" should be omitted )happiness.