The most universal facial expression is£¬of course£¬the smile—its function is to show happiness and put people at __1__(easy)£®It does not always mean that we are __2__(true)happy£¬however.Smiles around the world can be false£¬hiding other feelings __3__anger£¬fear or worry.There are unhappy smiles.For example£¬__4__someone loses face£¬he smiles to hide it.__5__£¬the general purpose of smiling is to show good feelings.