用所給單詞的適當(dāng)形式填空,使短文通順,正確,連貫（每個詞限用一次）
paper ,inside,useful,million ,new ,cost ,by ,have,outside,famiy,weight,little,find,make
hold up
All over the world men are searching for new techniques to provide a great deal of housing,inexpensive and quick,for ( 1 ) of low-and-middle-income( 2 )
and to meet the urgent housing requirements caused ( 3 )flood and earthquakes.Acompany in Pennsylvania ,the U.S.A.believes it ( 4 )one method,
houses made of ( 5 ).About ten years ago the company supplied a number of
the ( 6 )moldel as urgent housing for thousands of farm workers in California.
Today,the paper houses are still( 7 ) well.The builders now guess that the houses well.The builders now guess that the houses ( 8 )a useful life of at
( 9 ) 15or 20 years.
The newer paper houses( 10 ) of a specially designed,5\16-inch-thick,
chemically treated kraftboard.When coated on the ( 11 ),the board has a strength of 2,000 pounds per square inch .( 12 ),the paint on the walls and
ceiling can withstand temperatures up to 1,900 degress F.Th kraftboard is water-resistant.
The basic housing unit ,which ( 13 )about $950,is 20 by 20.5 feet,( 14 )
about 450 pounds,and can be packed in two large boxes that are easily transported
in a truck.Once the base platform has been built,three workers can set up one house in about five hours,the basic design can be extended to any length,or can be built in a wide variety of ways for some special( 15 ),such as a classroom,meeting hall or library.