用方框中所给单词的适当形式填空，使短文正确、通顺（每词限用一次）。
Dear Dick,
How time flies! I have been back to school 小题1: two weeks. These days, I have 小题2: a lot about the population in China.
China has a population of 1.3 billion. It has reached about one 小题3:of the world’s population. About 80 percent of the people live in the 小题4:. It causes many difficulties. In less developed areas, not all the parents can offer 小题5: children a good education. Some children can’t go to school.
China has taken measures to 小题6: the population. China’s economy （经济）grows 小题7: faster and their living conditions have changed a lot. 小题8:of us have lived in bright and tall buildings. We have had ring roads and they are 小题9: enough. We have had more comfortable life.
小题10:, the large population problem is still serious in China.
How about the population of your country? Can you tell me about it?
Yours,
Maria
小题1:for
小题2:learned
小题3:fifth
小题4:cities
小题5:their
小题6:control
小题7:much
小题8:Most
小题9:wide
小题10:However
题目分析：这篇短文介绍了玛丽写给迪克的一封信。信中介绍了中国的现状。中国发展的很快但是也存在着巨大的问题，如环境污染问题。
小题1:我已经回到学校有两周了，for 达……，故填for
小题2:这些天关于中国的人口我学到了许多，该句是现在完成时态，故填learned
小题3:中国的人口大约占世界人口的五分之一。在英语中分子用基数词表达，分母用序数词表达如果分子大于1，分母变复数。故填fifth
小题4:百分之八十的人生活在城市，名词复数，故填cities
小题5:在不发达的地区不是所有的父母都能为他们的孩子提供好的教育。形容词性的物主代词后加名词，故填their
小题6:中国已经采取措施以控制人口。故填control
小题7:中国的经济发展的更快了。Much,修饰比较级，说明比较的程度，故填.much
小题8:我们中大部分人已经住进了明亮的高楼里。大部分，故填.Most
小题9:我们有了环形路，他们足够的宽阔，故填wide
小题10:然而在中国巨大的污染问题仍然严重However