The 1903 film The Great Train Robbery was the first significant film in which the classic western story’s formula of crime and retribution _____ .

Mars, the so-called red planet, is actually colored red by iron oxide and other impurities _____ the whole surface.

Portland, _____ , is located primarily on two hilly peninsulas overlooking Casco Bay and its many islands.

Clouds _____ in warm air rises, cools, and condenses.

Despite its fishlike form, the whale is _____ and will drown if submerged too long.

Although legend has it that the Pilgrims first set foot in America on Plymouth Rock in 1620, _____ documentary evidence confirming this.

Comparative anatomy is _____ classification of both plants and animals.

Long before the advent of written literature, _____ their myths and stories in oral poems told by successive generations.

_____ of classical ballet in the United States began around 1830.