Food is most important for life. Without it man would die of hunger（1）the need for food,man also has need for house to protect him （2）heat and cold,wind and rain.
The first man's homes were very simple. The size and kind of houses at that time were limited（3）his building skill and also by the things for him to use. In some places,man's home would be（4）more than a large hole in the side of a hill,with a fire at the gate to give him light,to cook food and to keep dangerous animals away.
But now in （5）century,house building work has become an important industry. Modern science makes it possible for man to build so many large（6）for government offices,shops,schools,hotels,hospitals,churches.…
As the population of the world grows（7）houses of many kinds are needed.
The house with three （8）for the average family would not be（9）for a very rich family. The average families also want to live comfortably. So people are trying their best to improve their houses（10）it is expensive,Different kinds of modern houses are being designed and some of them have been built up for rich families to live in,and also some for average families.
2. 第(3)选（）
A by
B to
C in
D of
