The Louisiana Territory, an area ............. the size of France, was bought by the United States from France for $15,000,000 in 1803.

Despite claims that filters and low-tar tobacco make smoking somewhat safer, in fact they only marginally reduce, ............. eliminate the hazards.

. ............. many of the designs for the new capital were considered lost forever, Benjamin Banneker helped reproduce the original plans.

Few natural elements exist in ............. that they are rarely seen in their natural environments.

Generally speaking, every person ............. the potential to be a teacher, to some extent.

. ............. business, a merger is a combination of two or more corporations under one management.

............. of commodities by air began in the 1920s at the same time as airmail service.

Jan Malzeliger's invention, the shoe-lasting machine, ............. production but it also cut the cost of shoe production by half.

It can sometimes ............. a home.

Jellyfish are probably ............. on Earth.