Conservation organizations help for  to preserve the ecology of area by keeping track of dangered species.

Ancient people made a clay potty because  they needed it for their survival 

Those of us who (have a family history of heart disease should make year appointments with their doctors

The number of students in this class …………. limited to thirty.

It has been found that length of light or dark periods influence certain activities of flowering plants 

As the marathon runner reached the half-way mark, he, being hot and was soaked with perspiration, stopped to rub himself down with towel.

Mobility is one of the characteristics often demanded of executives, and they must accustom themselves to move as regularly.

Find mistakes and correct

The teacher taught her students to look careful to the left and the right least three times before crossing the highway.

Any group that conducting its meeting using parliamentary will encounter situations where prescribed procedures cannot be applied.

Wordsworth was one of the first European poet to consider the lowliest members of society being valid subjects for poetry.

The amount of books the Library of Congress is more than 58 million volumes.

Until Hollywood invented him, Leonardo DiCaprio was practically unknown 

Before the formation of labor unions, individual workers had almost not voice determining their wages, hours, or working conditions

All almost the electricity for industrial use comes from large generators driven steam turbines

Indiscriminately dumping of waste material and inadequate sewage treatment are two serious causes environmental pollution.

Many Civil War battles were fought in Virginia than any other state

The knee is more likely to be damage than most other joints because it is subject to tremendous forces during vigorous activity.

Silly, whiny conversation on child level was meant to create tension and heighten Nancy’s fears and anxiety.

This floor doesn’t need no more wax; there’s plenty already .

In the 1800’s store owners sold everything from a needle a plow, trust everyone, and never took inventory.

Many automobile factories have found that human operators work more effective than automated ones in regard to flexi decision making