1.In the 1930�s few major orchestras in the United States hired woman , so many chose to perform in amateur musical groups as an alternative .





2.Complex spacecraft are characterized by a various of supporting systems including communications, guidance and navigation, altitude control, and, in some cases , life-support systems.





3.When a piano board is substituted for buttons on right side of an accordion, the instrument is known as a piano accordion.





4.Today�s lunar and solar eclipses can be predicted to within seconds of its occurrences, and interest in them is scientific as well as aesthetic.





5.The windowless inner rooms of the Pueblo Bontio in New Mexico served for the storage of supplies, while the brighter outer rooms were using for living quarters.





6.Ultrasonic is concerned with sound vibrates or waves of a frequency above 20,000 cycles per second, the upper range audible to the human ear.





7.Freesia plants reach a height of two and one-half feet and thrive best at temperature of 50 degrees to 60 degrees Fahrenheit.





8.Common salt occurs naturally in pure, solidly form as the mineral halite and in widely distributed deposits of rock, or mineral, salts.





9.The term �metabolism� refers to the chemical changes which by living things transform food into energy.





10.Materials that of clay are among the most ancient manufactured articles and have played a vital role in human civilization.