When you feel sad， you should try going outside if it is sun． Doctors                 （1） 　　

know that how manysunlight we got can change how we feel．                              （2） 　　

Scientists learned this by interviewpeople who live different parts of                      （3） 　　

the world． In the far north， the days ∧ very short in winter． People there often （4） 　 ____

say that they feel unhappy in thewinter． In the south where there are more                  （5） 　　

daylight hours， fewerpeople say they are unhappy in winter． The reason is          （6） 　_____

how much sunlight these people get each day． Sunlight changesomething in          （7） 　______

our bodies， which can make people feel happily．Another way to feel                   （8） 　　

happy is to get much exercise． Just like sunlight， exercise helps our bodyfeel      （9） 　_____

happier． Thatyou are upset about something， exercise is a good way to get         （10） 　_____

those bad feelings out of yourself．