题目内容：

“How are you？” is a usual question.It's a friendly way that people in America greet each other，71.1. “How are you？” is also a very unusual question.It's a question that often doesn't have an answer.The person who asks “How are you？” 72.2.to hear the answer “Fine”，even if the person's friend isn't fine.The reason is that “How are you？” isn't really a question and “Fine” isn't really an answer.They are just other 73.3.t of saying “Hello” or “Hi”．

Sometimes，people also don't say exactly what they 744.．For example，when someone asks “Do you agree？” the other person might think，“No，I disagree.I think you're wrong...”But it is 75.5. to disagree so strongly，so the 76.6. answer may be “I'm not sure.” It's a nicer way to say that you don't agree with someone.

People also don't say exactly what they are thinking when they finish 77.7. with other people.Many people talking on the phone finish the 78.8. by saying “I've to go now.” Often，the person who wants to hang up gives an excuse like “Someone's at the door.” The excuses might be real，or it might not be 79.9.．Perhaps the person just doesn't want to keeping on talking.80.10.，the polite excuse won't hurt the other person.All in all，it's an important way that people try to be nice to each other，and it's a part of the game of language.