1.
Fingerprints form an unchangeable signature, and______ for identification, despite changes in the individual’s appearance or age.
2.
Animals obtain their energy from______ .
3.
Liquid water has fewer hydrogen bonds than ice, so more molecules can occupy the same space, making liquid water______ than ice.
4.
It is difficult for present-day readers______ Sister Carrie was withdrawn from circulation at the turn of the century.
5.
Historical linguists study______ over time.
6.
Tennis star Chris Event, who retired from the game after eighteen years, perhaps______ more than anyone to make women’s professional tennis a widely respected career.
7.
The daytime______ bright because the Earth’s atmosphere scatters sunlight.
8.
Edward Hopper’s paintings portray the loneliness and isolation of the individual______ .
9.
Braille,______ printing reading materials for use by people who are blind, consists of a system of raised points or dots that are read by touch.
10.
The art of landscape architecture is almost as old______ of architecture itself.
11.
The development of synthetic fibers after 1940 led to the production of new types of fabrics ______ more durable and easier to care for.
12.
Until the eighteenth century, charcoal was______ used in blast furnaces, as well as in glassmaking, blacksmithing, and metalworking.
13.
Pure iron cannot be hardened by heating and cooling, as______ , because iron lacks the necessary carbon.
14.
Rapids and waterfalls, ______ along virtually all Massachusetts waterways, provided power in colonial times for grist and saw mills and later for textile mills.
15.
Airsickness is produced by a disturbance of the inner car,______ psychogenic factors, such as fear, also play a part.
