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Man cannot go on (1) his numbers at the present rate, In the (2) 30 years man will face a period of crisis. (3) experts believe that there will be a widespread food (4) . Other experts think this is (5) pessimistic, and that man can prevent things (6) worse than they are now. But (7) that two-thirds of the people in the world are undernourished or starving now.One thing that man can do is to limit (8) of babies born. The need (9) this is obvious, but it is (10) to achieve. People have to (11) _ to limit their families. In the countries of the population (12) , many people like big families. The parents think that this (13) a bigger income for the family and ensures there will be someone in the family who will look (14) them in old age.Several governments have (15) birth control policies in recent years. (16) them are Japan, China, India and Egypt. In some (17) the results have not been (18) . Japan has been an exception. The Japanese adopted a birth control policy in 1948. People (19) to limit their families. The birth rate fell from 34. 3 per thousand per year to about 17. 0 per year (20) . 20（）
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Man cannot go on (1) his numbers at the present rate, In the (2) 30 years man will face a period of crisis. (3) experts believe that there will be a widespread food (4) . Other experts think this is (5) pessimistic, and that man can prevent things (6) worse than they are now. But (7) that two-thirds of the people in the world are undernourished or starving now.One thing that man can do is to limit (8) of babies born. The need (9) this is obvious, but it is (10) to achieve. People have to (11) _ to limit their families. In the countries of the population (12) , many people like big families. The parents think that this (13) a bigger income for the family and ensures there will be someone in the family who will look (14) them in old age.Several governments have (15) birth control policies in recent years. (16) them are Japan, China, India and Egypt. In some (17) the results have not been (18) . Japan has been an exception. The Japanese adopted a birth control policy in 1948. People (19) to limit their families. The birth rate fell from 34. 3 per thousand per year to about 17. 0 per year (20) . 8（）
Ideas about education are changing in the United States. Education today is not just a high school diploma or a college degree. Many adults are not interested in going to college. They are interested in other kinds of learning. For them, learning does not end with a diploma． Continuing education gives these adults the opportunity to increase their knowledge about their own field or to learn about a new field．It also gives them a chance to improve their old skills or to learn new ones. Scientists, mechanics and barbers can take classes to improve their work skills. If they know more or learn more, they can get a better job or earn more money. Continuing education classes give more adults the chances to learn new skills. There is usually a large variety of classes to choose from: typing, foreign cooking, photography, auto repair, furniture repair, or swimming. These are only some of the classes available. Some adults take classes for fun or because the class will be useful for them. Other adults take continuing education classes to improve their own lives because they want to feel better about themselves. Almost any community college or public school system has a continuing education program. There are classes in schools, community buildings or churches. Most classes are in the evening, so working people can attend．The classes are usually small, and they are inexpensive. The new idea about education in the U. S. is that______.
戏剧艺术历史悠久、（）繁多，仅西方话剧史上的悲剧，就有“命运悲剧”、“（）”、“（）”、“（）”等多种类型。
Human cloning technology could be used to reverse heart attacks. Scientists believe that they may be able to treat heart attack victims by cloning their healthy heart cells and injecting them into the areas of the heart that have been damaged, and other problems may be solved if human cloning and its technology are not forbidden. With cloning, infertile couples could have children. Current treatments for infertility, in terms of percentages, are not very successfully. Couples go through physically and emotionally painful procedures for a small chance of having children. Many couples run out of time and money without successfully having children. Human cloning could make it possible for many more infertile couples to have children than ever before. We should be able to clone the bone marrow for children and adults suffering from leukemia．This is expected to be one of the first benefits to come from cloning technology. We may learn how to switch cells on and off through cloning and thus be able to cure cancer. Cloning technology can be used to test for and perhaps cure gene-related diseases. The above is just a few examples of what human cloning technology can do for mankind．This new technology promises unprecedented advancement in medicine if people will release their fears and let the benefits begin. According to the writer, the main problem with the development of human cloning technology is that______.
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