根据短文内容，从短文后的选项中选出适当的选项补全短文，将选项的编号依次填人题后的横线上。

根据短文内容，从短文后的选项中选出适当的选项补全短文，将选项的编号依次填人题后的横线上。
Do you laugh every day? Most people do． 1 That is a lot of laughter．
In India，there are hundreds of laughter clubs． 2 First they put up their hands above their heads．Then they pretend to laugh．Soon everyone is laughing happily．People say they feel good after laughing together．
Scientists believe that laughter is good for you．Why? For one thing，laughter is good exercise． 3 Scientists say that one hundred laughs equals ten minutes of running．Laughing helps you relax．That’s good for you，too．
Why do we laugh? That is a hard question to answer． 4 They don’t laugh very often when they are alone．Many scientists believe that we use laughter to get on well with other people．Laughter helps us feel part of a group．
5 Some think that laughter makes sick people get better．Do you think so，too?