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1) R. M. Bartlett of Philadelphia ______________ the first private business college in the United States in 1843.
2) In 1989 the space probe Voyager 2 ______________ by the planet Neptune.
3) A cupful of stagnant water may ______________ millions of microorganisms.
4) Computers and new methods of communication ______________ revolutionized the modern office.
5) Sarah Knight ______________ a fascinating account of a journey she made from Boston to New York in 1704.
6) All animals ______________on other animals or plants.
7) Chromium ______________in the manufacture of stainless steel.
8) The Baltimore and Ohio Railroad ______________ the first air conditioning system for trains in 1931.
9) Porous rocks such as chalk and sandstone allow water ______________ through them.
10) By 1790, rice ______________ an important crop in the South.
11) Weavers are social birds that ______________ complex nests housing hundreds of families.
12) The American dancer Maria Tallchief first ______________ prominent in Europe.