17．Every November 21is World Hello Day，（61）when people say hello to each other to express friendliness and love．World Hello Day （62）was founded（found） in 1973by Brian and Michael McCormack，in （63）response （respond） to the conflict between Egypt and Israel．They sent a large number of letters on（64）the importance of communication to world leaders and celebrities to advocate setting（65）up World Hello Day．The first World Hello Day was celebrated on Nov.21，1973．
Originally，people around the world took World Hello Day as a （66）valuable（value） opportunity to encourage world leaders to use communication rather than force（67）to settle（settle） conflicts．（68）Later （late），ordinary people started to greet each other on that day to express（69）their （they） love for other people and world peace．
Now，World Hello Day is observed by people in 180countries．Why not greet your parents and friends （70）with a warm hello and a bright smile on this holiday？
