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Read the following passage and blacken the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks in the following question. 

Why is it that many teenagers have the energy to play computer games until late at night but can't find the energy to get out of bed in time for school? According to a new report, today's generation of children are in danger of getting so (20) _______ sleep that they are putting their mental and physical health at risk. Adults can easily survive on seven to eight hours' sleep a night, (21) _____teenagers require nine or ten hours. According to medical experts, one in five youngsters gets anything between two and five hours' sleep a night less than their parents did at their age. 

This (22) ______ serious questions about whether lack of sleep is affecting children's ability to concentrate at school. The connection between sleep deprivation and lapses in memory, impaired reaction time and poor concentration is well (23) _________. Research has shown that losing as little as half an hour's sleep a night can have profound effects on how children perform the next day. A good night's sleep is also crucial for teenagers because it is while they are asleep (24) they release a hormone that is essential for their 'growth spurt' (the period during teenage years when the body grows at a rapid rate. It's true that they can, to some extent, catch up on sleep at weekends, but that won't help them when they are dropping off to sleep in class on a Friday afternoon. 

Read the following passage and blacken the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following questions. 

   Advertising helps people recognize a particular brand, persuades them to try it, and tries to keep them loyal to it. Brand loyalty is perhaps the most important goal of consumer advertising. Whether they produce cars, canned foods or cosmetics, manufacturers want their customers to make repeated purchases. The quality of the product will encourage this, of course, but so, too, will affect advertising. 

   Advertising relies on the techniques of market research to identify potential users of a product. Are they homemakers or professional people? Are they young or old? Are they city dwellers or country dwellers? Such questions have a bearing on where and when ads should be played. By studying readership breakdowns for newspapers and magazines as well as television ratings and other statistics, an advertising agency can decide on the best way of reaching potential buyers. Detailed research and marketing expertise are essential today when advertising budgets can run into thousands of millions of dollars. 

   Advertising is a fast-paced, high-pressure industry. There is a constant need for creative ideas that will establish a personality for a product in the public's mind. Current developments in advertising increase the need for talented workers. 

   In the past, the majority of advertising was aimed at the traditional white family - breadwinner father, non working mother, and two children. Research now reveals that only about 6 percent of American households fit this stereotype. Instead, society is fragmented into many groups, with working mothers, single people and older people on the rise. To be most successful, advertising must identify a particular segment and aim its message toward that group. 

   Advertising is also making use of new technologies. Computer graphics are used to grab the attention of consumers and to help them see products in a new light. The use of computer graphics in a commercial for canned goods, for instance, gave a new image to the tin can. 

What does the passage mainly discuss?