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The riskiest  _____________  of the development of new medications are the trials with human subjects.

Other varieties of the game popular in _______ parts of the world have Australian football and Gaelic football.

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Though many scientific breakthroughs have resulted from mishaps it has taken brilliant thinkers to recognize their potential.

By the time Brown's daughter graduates, ............... retired.

Some farmers could hardly support their families                   they worked very hard in the fields.

Music, artful arrangement of sounds _______ time.

Internet Service is the latest mode of .................  which helps US get required information directly through computers by opening the site.

National parks are managed primarily for public recreation,  _______ exceptional locations where visitors can view wildlife and enjoy the outdoors.

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They said that they ................. their house.

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The company __________   lowered its prices to outsell its competitors and attract customers.

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If the deserts are ________ managed, there may be troubles for scientific expeditions.

National parks are managed primarily for public recreation, providing exceptional locations where visitors can view wildlife and enjoy the _______.

National Parks and Preserves, unique public lands or bodies of water within a country, set aside by the government to protect ecosystems, plant and animal species, scenic landscapes, geologic formations, or historical or archaeological _______.

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For optimal safety on the road, avoid ------the view of the rear window andside-view mirrors.

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--------- Mr. Williams addressed the audience, he showed a brief video about the engine he had designed.

Spring is ____ best season of the year. Autumn is _____ busy season.

This definition is obviously very broad, but a narrower one would exclude _______ much.

Surprisingly, however, psychologists  ______ that most victims are middle-aged housewives who have never used a computer before.

After he______ his English course, he went to England to continue his study 

National Parks and Preserves, unique public lands or bodies of water within a country, set aside by the _______ to protect ecosystems, plant and animal species, scenic landscapes, geologic formations.

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Having proper ventilation throughout the building is  _____________  for protecting the health and well-being of the workers.