填空题 .Facial expressions have many meanings depending on contexts and relationships. Take the smile for example, it has many functions but     1    it is an expression of pleasure. A smile may show affection,     2    , or disguise true feeling. While pain is conveyed by a grimace, which also signifies disgust or disapproval. Surprise, shock, or     3    can be shown by raising one's eyebrows.
    The degree of facial expressiveness also varies among     4    . Given individual differences, Americans express themselves facially in varying degrees. People from certain ethnic backgrounds in the United States may use their hands, bodies, and faces more than other Americans. There are     5    , although it is considered negative or suspicious to have a "deadpan" expression or a "poker-face".

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