The first writing _____ evidence of is on Mesopotamian clay tablets.

_____ drought-resistant plants which store water in

fleshy tissue.

Benjamin Kabelsky, whom ____ as Jack Benny, was a famous comedian in vaudeville and on radio and television.

_____ that hunted other animals tended to have very narrow, sharp, curved claws.

The first eyeglasses had convex lenses for the aged who ____ farsighted.

Chimney Rock, ____ 500 feet above the North Platte River, has eroded considerably in the last two centuries.

_____ that accompany recurring bouts of severe depression reduce bone density.

Willa Cather is an author _____ for her evocative and memorable vision of frontier prairie life.

Mars’s tiny moon Phobos is a small mountain of rock that _____ from the asteroid belt by Mars’s gravitational pull.