TASK DEFINITION: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
PROBLEM: Article: Americans often plan social gatherings on short notice, so don't be surprised if you get invited to someone's home or to see a movie or baseball game without much warning. If the time is convenient for you, surely accept their invitation. But if you're busy, don't be afraid to _ the invitation, perhaps suggesting a time that would be better. Your host won't be shamed. Invitations are usually sent in person or over the telephone. The main exception is for some formal occasions, in which case a written invitation will be mailed. You would normally receive a written invitation to a wedding . For a casual dinner invitation, don't arrive more than 5 minutes early, because your host may still be preparing for your visit. Arriving more than 10 minutes late is considered rude if very few people were invited. If many people were invited, it's OK to arrive a little late, even as much as half an hour late. For example, it's OK to arrive late for a party, for a potluck dinner or for a social gathering inviting a large group of people. If you're invited for dinner, it's proper to bring the host a bottle of wine, a gift basket of fruit, a box of candy , or a bouquet of flowers. Don't bring roses, as men often give roses to women on a date . If you wish to thank the host for his or her hospitality , it's right to call or send a brief written thank-you note the next day.
Answer: something about American social visits.

SOLUTION: The passage is to tell us _ .

PROBLEM: Article: Why are we addicted to upgrades? According to Donald Norman, American author of the book The Design of Everyday Things, "planned obsolescence" is the trick behind the upgrading culture of today's consumer electronics industry. The New York Times cited Norman last month, saying that electronics manufactures strategically release new upgrades periodically, both for hardware and software, so that customers on every level feel the need to buy the newest version. "This is an old-time trick- they're not inventing anything new," he said. Thomas Wensma, a Dutch designer, despises the "planned obsolescence" of companies, as recently reported by UK-based The Guardian. Wensma said this is a wasteful system through which companies - many of them producing personal electronics - release shoddy products simply because "they know that, in six months or a year, they'll put out a new one". But the new psychology of consumers is part of this system, as Wensma said to the newspaper: "We now want something new, something pretty, the next shiny thing." _ "It's to the damage of the consumer and the environment," as the New York Times quoted Norman. "But perhaps to the betterment of the stockholder." In its most recent fiscal year, Apple's profit margin was more than 21 percent, reported the Los Angeles Times. At Hewlett-Packard, the world's biggest PC manufacturer, it was only 7 percent. "Steven Jobs pushed the principle of 'planned obsolescence' to new heights," the newspaper commented on the company's profits and marketing strategy. "Apple's annual upgrades of its products generate sales of millions of units as owners of one year's MacBook or iPhone line up to buy the newest version, even when the changes are incremental." Peer pressure As to Li Jijia, the need for upgrading his smart phone comes mainly from friends and classmates. When the majority of friends are switching to the latest devices, he worries about feeling left out. "Some apps and games require better hardware to run," said Li. "If you don't join in, you lose part of the connection to your friends."
Answer: they can make a lot of money

SOLUTION: Donald Norman believes that electronics makers strategically release new upgrades periodically because _ .

PROBLEM: Article: As a student, you must be excited to know something about American school students. In fact, just like in China, in the United States, high school is usually divided into two periods, the first two or three years are called "junior high school" and the other is "senior high school". In China, children enjoy free education of nine years, but in the United States, the students enjoy free education(which will be started when they are about 6 years old) until they are 18 years old. As a result of the free education system, American children have little difficulty in going to senior high school. American high school students can take part in a lot of activities outside of the classroom. The activities are organized by the school, such as joining a music group or a sports team. Certainly, just like us students in China, American students have to work hard in order to get good marks if they want to go to a good university. They take classes in all kinds of subjects all through the high school period. And students with low marks at the end of a school year are still allowed to go on to the next grade. In American high schools, there is fighting or hurting or other kinds of bad behaviors. So children who want to go to university are often sent to suburban high schools, where most students want to go to university and the atmosphere is quite different.
Answer: education of American high school

SOLUTION:
This passage mainly tells us about _ .