语法填空

阅读下面短文, 按照句子结构的语法性和上下文连贯的要求, 在空格处填入一个适当的词或使用括号中词语的正确形式填空.

     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.

     From __6__time we are babies, we show __7__(happy)or anger by frowning.In most places around

the world, frowning or turning one's back to someone __8__(show)anger.Making a fist or __9__(shake)

it almost always means that someone is angry and threatening __10__person.