请根据句意或括号中的中文提示、英文释义，写出句中所缺单词，使句子通顺。

    About 70，000，000 Americans are trying to lose weight．This is almost one out of every three people in the United States．Some people eat 1food and they hardly have any fats or sweets. Others do running exercise with machines，take medicines，or even have operations2you can see losing weight is 3 work，and it will also cost a lot of money．But 4do so many people in the United States want to lose weight?
    Many people in the United States worry about their look of the body．For many people，looking nice also means to be 5．Other people worry about their health as many doctors 6 overweight is not good．
    Most people want to find a faster and 7 way to take off fat，and books of this kind are very popular．These books tell people how to lose weight．Each year a lot of new books like these are 8．Each one says it can easily help people take fat away．
    Losing weight can be expensive．Some overweight people go to health centers，like La Costa in California．Men and women9several hundred dollars a day at these health centers．People live there for one week or two，taking exercise，eating different foods．Meals there may be just a little．All this works for losing weight．104 days on the program，one woman called Mrs. Warren lost 5 pounds(2.27kg)．At 400 dollars a day, she spent 320dollars to lose each pound．But she said she was still glad to do so．
    Health centers，books，medicines，operations，running and exercise machines all get a lot of money．So in the United States，losing weight may mean losing money too.

    About 70，000，000 Americans are trying to lose weight．This is almost one out of every three people in the United States．Some people eat 1food and they hardly have any fats or sweets. Others do running exercise with machines，take medicines，or even have operations2you can see losing weight is 3 work，and it will also cost a lot of money．But 4do so many people in the United States want to lose weight?
    Many people in the United States worry about their look of the body．For many people，looking nice also means to be 5．Other people worry about their health as many doctors 6 overweight is not good．
    Most people want to find a faster and 7 way to take off fat，and books of this kind are very popular．These books tell people how to lose weight．Each year a lot of new books like these are 8．Each one says it can easily help people take fat away．
    Losing weight can be expensive．Some overweight people go to health centers，like La Costa in California．Men and women9several hundred dollars a day at these health centers．People live there for one week or two，taking exercise，eating different foods．Meals there may be just a little．All this works for losing weight．104 days on the program，one woman called Mrs. Warren lost 5 pounds(2.27kg)．At 400 dollars a day, she spent 320dollars to lose each pound．But she said she was still glad to do so．
    Health centers，books，medicines，operations，running and exercise machines all get a lot of money．So in the United States，losing weight may mean losing money too.

    About 70，000，000 Americans are trying to lose weight．This is almost one out of every three people in the United States．Some people eat 1food and they hardly have any fats or sweets. Others do running exercise with machines，take medicines，or even have operations2you can see losing weight is 3 work，and it will also cost a lot of money．But 4do so many people in the United States want to lose weight?
    Many people in the United States worry about their look of the body．For many people，looking nice also means to be 5．Other people worry about their health as many doctors 6 overweight is not good．
    Most people want to find a faster and 7 way to take off fat，and books of this kind are very popular．These books tell people how to lose weight．Each year a lot of new books like these are 8．Each one says it can easily help people take fat away．
    Losing weight can be expensive．Some overweight people go to health centers，like La Costa in California．Men and women9several hundred dollars a day at these health centers．People live there for one week or two，taking exercise，eating different foods．Meals there may be just a little．All this works for losing weight．104 days on the program，one woman called Mrs. Warren lost 5 pounds(2.27kg)．At 400 dollars a day, she spent 320dollars to lose each pound．But she said she was still glad to do so．
    Health centers，books，medicines，operations，running and exercise machines all get a lot of money．So in the United States，losing weight may mean losing money too.

请根据句意从方框中选择合适的单词，并用其适当形式填空，使句子通顺。

请根据句意从方框中选择合适的单词，并用其适当形式填空，使句子通顺。

    A young man went to the local expert(专家) on gems and said he wanted to become a gemologist(珠宝家). The expert turned him down because he feared the youth would not have the patience to learn. The young man asked for a chance. Finally, the expert told the youth, "Be here tomorrow."
    The next morning the expert put a jade(玉) stone in the youth's hand and told him to hold it. The expert then went about his work, cutting, weighing and setting gems. The boy sat quietly and waited.
    The following morning the expert again put the jade stone in the youth's hand and told him to hold it. On the third, fourth and fifth days, the expert asked the young man to do the same thing. On the sixth day, the youth held the jade stone but he could no longer stand(忍受) the silence. "Master, when am I going to learn something?" he asked. "You will learn." the expert said and went about his business.
    Several more days went by and the youth almost lost his patience. But one morning as the master put the stone in the youth's hand, the young man said without looking at his hand, "This is not the same jade stone!" "You have begun to learn." said the master.
    Practice makes perfect. The experience we learned from practice teaches us and develops our abilities. Experience is the best teacher. Even the most successful person had no absolute confidence once. It is experience that gives people confidence. The truth is: if you do the work and gain the experience, you'll have more confidence because you'll actually know what you're doing.

    A young man went to the local expert(专家) on gems and said he wanted to become a gemologist(珠宝家). The expert turned him down because he feared the youth would not have the patience to learn. The young man asked for a chance. Finally, the expert told the youth, "Be here tomorrow."
    The next morning the expert put a jade(玉) stone in the youth's hand and told him to hold it. The expert then went about his work, cutting, weighing and setting gems. The boy sat quietly and waited.
    The following morning the expert again put the jade stone in the youth's hand and told him to hold it. On the third, fourth and fifth days, the expert asked the young man to do the same thing. On the sixth day, the youth held the jade stone but he could no longer stand(忍受) the silence. "Master, when am I going to learn something?" he asked. "You will learn." the expert said and went about his business.
    Several more days went by and the youth almost lost his patience. But one morning as the master put the stone in the youth's hand, the young man said without looking at his hand, "This is not the same jade stone!" "You have begun to learn." said the master.
    Practice makes perfect. The experience we learned from practice teaches us and develops our abilities. Experience is the best teacher. Even the most successful person had no absolute confidence once. It is experience that gives people confidence. The truth is: if you do the work and gain the experience, you'll have more confidence because you'll actually know what you're doing.

    A young man went to the local expert(专家) on gems and said he wanted to become a gemologist(珠宝家). The expert turned him down because he feared the youth would not have the patience to learn. The young man asked for a chance. Finally, the expert told the youth, "Be here tomorrow."
    The next morning the expert put a jade(玉) stone in the youth's hand and told him to hold it. The expert then went about his work, cutting, weighing and setting gems. The boy sat quietly and waited.
    The following morning the expert again put the jade stone in the youth's hand and told him to hold it. On the third, fourth and fifth days, the expert asked the young man to do the same thing. On the sixth day, the youth held the jade stone but he could no longer stand(忍受) the silence. "Master, when am I going to learn something?" he asked. "You will learn." the expert said and went about his business.
    Several more days went by and the youth almost lost his patience. But one morning as the master put the stone in the youth's hand, the young man said without looking at his hand, "This is not the same jade stone!" "You have begun to learn." said the master.
    Practice makes perfect. The experience we learned from practice teaches us and develops our abilities. Experience is the best teacher. Even the most successful person had no absolute confidence once. It is experience that gives people confidence. The truth is: if you do the work and gain the experience, you'll have more confidence because you'll actually know what you're doing.