短文填空先通读下面的短文，然后根据短文内容和所给首字母，在空格内填入一个适当的词，使短文意思完整。
      American people like to say “Thank you” when others help them or say something kind to them. People of many other countries do so, too. It is a very good habit.
      You should say “Thank you” when someone p____  you the salt on the table, when someone walking before you k____  the door open for you, when someone s____  you have done your work well, or you have b____  a nice thing, or your city is very beautiful. “Thank you”is used not only between friends, but also between parents and children, brother and sisters, husbands and wives.
    “Excuse me”is another s____  sentence they use. When you hear someone say so behind you, you know that someone wants to walk p____ you. It is not polite to b____  others while they are talking. If you want to speak to one of them, say “Excuse me” first, and then begin talking. You should also do so when you want to cough(咳嗽) or make any u____  noise before others.

①乙省人均收入的确比甲省要高   
②甲乙两省份居民消费结构的差异

③甲乙两省食品物价变动差异较大 
④甲省的居民非食品支出过多

   American school life is different from (和……不同) Chinese. American students usually get to school at around 8:30 in the morning. They put their school bags in their lockers (柜子) and only take one book, one notebook and one pen to each class. In class, American students can sit in their seats (座位) when (当……时候) they answer their teachers questions
   At around 12:00 students have lunch. American students don’t go home for lunch. They have it at school. Most students like pizza(比萨), hot dogs or hamburgers. At 1:00 in the afternoon, they start to have classes. Their classes are usually over(结束) at three o’clock. Then they join in the activities （活动）of clubs or sports.