第二节语法填空（共10小题；每小题1.5分，满分15分）
阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在答题卷标号为31-40的相应位置上。
The advantages and disadvantages of a large population have long been a subject of discussion. It 31 (argue) that the supply of good land is limited. To feed a large population, inferior land must be cultivated and the good land worked 32(intensive). Thus, each person produces less and this means a lower average income than could be obtained with  33  smaller population.
One of the  34(difficult) in carrying out a world-wide birth control program is that official attitudes to population growth vary from country to country. In a developing country  35  a vastly expanded population is pressing hard upon the limits of food, space and natural resources, 36 will be the first concern of government to place a limit  37  the birthrate, whatever the consequences may be. A decreasing birthrate may lead to unemployment because it results in a 37(decline) market. When the pressure of population on housing declines, prices also decline and the building industry is weakened.  39(face)  with such considerations, the government of a developed country may well prefer to see a slowly increasing population,rather than one which is stable  40 in decline.