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1) In the United States,_____________ is generally the responsibility of municipal governments.
17) In some cases,_______________ to decide if an organism is a plant or an animal.
2) Crop rotation_____________of preserving soil fertility.
18) The first American novelist to have a major impact on world literature_____________
3.____________the dollar as its monetary unit in 1878.
19) ___________ important railroad tunnel in the United States was cut through the Hoosac Mountains in Massachusetts.
4.___________almost impossible to capture the beauty of the aurora borealis in photographs.
20) Generally,_______________ in the valleys and foothills of the Pacific Coast ranges.
5) Usually, political cartoons___________on the editorial page of a newspaper.
21) When bats are at rest,____________ hang upside-down.
6.____________two major art museums, the Fogg and the Sadler.
22) _____________that the capital of South Carolina was moved from Charleston to Columbia.
7) American actress and director Margaret Webster_____________for her production of Shakespearean plays.
23) Although not as important as they once were,_______________ a major form of transportation in North America.
8) _____________gas tanks connected to welding equipment, one full of oxygen and the other full of acetylene.
24) The Loop, which is the commercial heart of Chicago,_______________ within a rectangular loop of elevated train tracks.
9) __________is more interested in rhythm than in melody is apparent from his compositions.
25) _______________ amino acids that serve as the basic building blocks of all proteins.
10) Compressed air___________the power to drive pneumatic tools.
11) ______________by cosmic rays.
12) ___________primary colors are red, blue, and yellow.
13) ______________ who was elected the first woman mayor of Chicago in 1979.
14) Every computer consists of a number of systems_____________together.
15) On the Moon,__________ air because the Moon’s gravitational field is too weak to retain an atmosphere.
16) The Glass Mountains of northwestern Oklahoma______________with flecks of gypsum, which shine in the sunlight.