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　　Across the world, students are sweating as they prepare for all kinds of exams．Many teenagers complain that while they do well in their homework, they don't get 　　1　　 marks in exams．They are wondering why．

　　In a new study U．S．psychologists think they have found the answer．Researchers report that heavy exam 　　2　　 is actually more likely to affect the performance of very good students than average ones．

　　Worried about 　　3　　 others, these students can lose their most valuable 　　4　　 weapons：short-term or working memory．This is their ability to 　　5　　 numbers and ideas, while focusing on problem at hand．According to the study, when 　　6　　 pressure is put on people with good skills, their performance drops．

　　People with strong working memory skills 　　7　　 to do well in intellectual ability test．Their analytical skills and creative 　　8　　 depend on their short-term-focused processor．

　　In the study, researchers 　　9　　 the working memory of 93 students．They were divided into two groups, with a high and a low 　　10　　 memory．

　　The students then took two maths tests each under 　　11　　 conditions．One was called a practice test．In the other, the students were told they were part of a team that was depending on them to 　　12　　 their score in order to win a reward．

　　The results were 　　13　　：the group with high working memory scored about 10 percent higher than the others on the low-pressure practice test．But the two groups' 　　14　　 were about equal when the pressure was on to perform．

　　The study shows how memory performance is 　　15　　 by fear of failure, according to the scientists．

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　　“A robbery…”a voice came from the radio．John was driving home late last night from a trip, and now he was having trouble staying 　　1　　．He turned 　　2　　 the radio and tried to fix his attention on the 　　3　　, but his eyes kept on closing．

　　It was 　　4　　 that he noticed the hitchhiker(搭便车者)by the road．　　5　　 even thinking about what he was doing, he stopped the car．

　　“To Midrille?”“Get in．”The hitchhiker got in and immediately John was 　　6　　 that he had picked him up．The young man 　　7　　 a strange face and long hair．When John asked him questions about himself, he changed the 　　8　　．

　　John 　　9　　 the news．He began to sweat and his thoughts 　　10　　 nervously to all the money he was 　　11　　．

　　At the next small town he stopped his car and said,“I'm sorry．I'm so 　　12　　 that I can't drive you to Midrille．I think I'll find a 　　13　　 and spend the night．”

　　The young man slowly 　　14　　 into his pocket．“This is it!”thought John．At that 　　15　　 moment he considered shouting for help, but instead of a gun, the hitchhiker pulled out several 　　16　　．“Oh, no．I don't want your money．Just get out．Okay?”

　　The young man looked 　　17　　．He insisted on 　　18　　 John the money．John watched until his 　　19　　 had disappeared from sight, then stepped on the 　　20　　 and drove out of town．