1.
......... crumbles readily when exposed to a moist, acid atmosphere, but the stone is durable in a dry atmosphere.
2.
By using their trunks, elephants can tell the shape of an object and ........ is rough or smooth, or hot or cold.
3.
In 1989 Carret Hongo was chosen as ........ for the Pulitzer Prize in poetry.
4.
The Moon is much closer to Earth ...... is the Sun, and thus it had greater influence on the tides.
5.
The brain of an average adult is one of the largest organs of the body, ........about three pounds.
6.
Throughout history ........different representations for numbers and for the basic process of counting.
7.
Democratic governments constantly face the problem of balancing …..... the individual with the needs of society.
8.
Connecticut was the fifth of the original thirteen states …..... the Constitution of the United States.
9.
The chemical composition of sandstone is the same as ….....
10.
Hydrofoils can exceed 75 miles per hour, as compared with conventional watercraft, whose maximum speeds .......... approach 50 miles per hour.
11.
It was novelist and poet ….... in 1968 founded Jackson State University's Institute for the Study of the History, Life, and Culture of Black People.
12.
Before the Europeans arrived, American Indians were using virgin copper …... into ornaments, knives, and other artifacts.
13.
In western North America, …...... form the Great Divide, which separates the areas from which waters flow either eastward to the Atlantic or westward to the Pacific.
14.
Some ecologists believe ….... more than 50 percent of existing species will be lost in the next 100 years.
15.
Almost ….... substances expand in volume when heated and contract when cooled.
