The American Academy of Poets,  .......... the 1930s, provides financial assistance to support working poets

The onion is characterized by an edible bulb composed ofleaves rich in sugar and a pungent oil, ............... the vegetable's strong taste.

The photographs of Carrie Mae Weems, in which she often makes her family members ................., are an affectionate and incisive representation of the African American experience.

Ripe fruit is often stored in a place who contains much carbon dioxide so that the fruit will not decau too rapidly.

Many gases, including the nitrogen and oxygen in air,  ...... color or odor.

Fibers of hair and wool are not continuous and must normally be spun into thread ....... woven into textile fabrics.

Scientists believe the first inhabitants of the Americas arrived by crossing the land bridge that connected Siberia and .............. more than 10,000 years ago.

During the Pleistocene glacial periods ............... portions of the Earth where plant and animal life flourished, making it possible for people to subsist.

In 1852, Massachusetts passed a law requiring all children from four to eighteen years of old to attend school.

Three of every four migrating water birds in North America visits the Gulf of Mexico's winter wetlands.