The study is considered more successful because it__________ ．

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根据以下内容回答题：In social life，time plays a very important part．In the United States，guests tend to feel they are not highly regarded if the invitation to a dinner party is extended only three or four days before the Darty date．（1）this is not true in all countries．In other areas of the world，it may be considered foolish to make an appointment too far in（2）because plans which are made for a date more than a week away tend to be forgotten． The（3）of time differ in different parts of the world．（4），misunderstandings arise between people from cultures that treat time differently．Promptness is much（5）in American life．for example．If people are not prompt，they may be regarded as impolite or not fullv（6）．In the U．S．，when equals meet，a person who is five minutes late is（7）to nlake ashortaDology．If heis less than fiveminutes late，hewillsaya few．Wordsof explaination，though perhaps he will not（8）the sentence．To Americans，forty minutes of waiting is the beginning of the“insuh period”．No matter（9）is said in apology，there is little that can remove the destruction done by an hour’s wait．（10）in some other countries，a forty minute waiting period was not l／nusual．

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