Table Manners in America   
          Don’t circle your plate with your arms. If you do so, you will
become the focus(焦点) of the table. Everyone would wonder,"Is
there anything wrong with the food?" This may give a wrong message
that you don't like the food or something like that. 
     Don't push the plate back when finished. Leave it where it was.
Do you want to let the hostess(女主人) know that you've just
done a labour?
     Don't lean(倚靠)  back and say"I'm through"or"I'm full". Just
put the fork and knife across the plate. That's all. 
     Don't cut up everything before you start to eat. Cut only one
or two bites(块) at a time. 
     Never take a huge mouthful of anything. Do you want to show
how hungry you are? Don't do that. It's not so good.    
     It's never good   to reach across the table for anything. If the
thing you want is not at hand, simply ask the nearest person for
help, like “Mrs Smith, could you pass me the dish?”