When you read the sentence, the population of the earth has grown by10 people. That may not sound much,  it's about 14, 000 people per hour. Most of these new people are born in  (develop) countries. These countries are found in much of Africa, South America and parts of Asia.

    In the developed countries of Europe and North America, the population is growing very (slow). This is  women in these countries have, on average(平均), only one or two children. But in the developing countries, many women have five  more children. In the developing countries, more than one billion people already live below the poverty level(贫困线). These people don't have enough food  (eat) and they live in poor housing. Children get little or no time at school and suffer from many  (kind) of diseases.

    The UN has said that the world's population will reach over 10  (billion) by the year 2100.If the number  (make) your head spin(眩晕), you're not alone. Many experts(专家) are worrying that so fast population  (grow) could have very bad results. It could hurt the environment and increase the number of poor people.