Insect pests are among the leading causes of crop failure.

Double Eagle in the first transatlantic balloon, was greeted by avid crowds in France.

When carbon is added to iron in the proper proportions , the result is steel.

The company issues an annual report every March.

By the nineteenth century, embroidery on men's clothing had virtually disappeared except for the occasional decorative vest and tie.

Communication is one of the most important bonds that hold cultural systems together.

The economy of Dallas, Texas, is strong and diversified .

The fear of smallpox, which terrorized the eighteenth century, has no analogy(likeness) today.

Some sea urchins海胆 have venomous (toxin) spines

Ella Grasso, elected governor of Connecticut in 1974, supported the enactment (given, granted) of a freedom-of-information law.