Some heating devices convert chemist energy like that found in wood and coal into heat energy.

This is an expensive ________ very useful book.

They said both he_________ I were to come.

Only when black bear has been spotted by the forest rangers will this portion of the park be closed down.

He is only sixteen, and ________, he is not eligible to drive a car.

The Mediterranean, a large sea surrounded by land, is a mile depth on the average and more than 2.000 miles long.

I dropped out of college after one term and went on traveling around the world instead.

Most types of dolphins live at less twenty-five years, and some species may reach 50 years of age

The firstly naval battle of the Revolutionary War was fought off the coast of Machias, Maine, in June 1775.

Unlike competitive running race, race walkers must always keep some portion of their feet in contact with the ground.

An effective paragraph must _______ be unified and ordered but also complete.

The number of teaching assistants required meeting undergraduate course needs is rapidly increasing.

I couldn't unlock it_______ I had the wrong key.

I’m just going to the shops; if anyone rings, tell them I will be back for a few minutes.

The officials of the Board of Elections asked that each voter present their registration card and a valid Texas driver’s license before receiving a ballot.

In some species of fish, such the three-spined stickleback, the male, not the female, performs the task of caring for the young.

He felt ill_______ he went to bed early.

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

Jim didn’t have a house and a car, for he was jobless for a long time

In the early days of jet development, jet engines used great numbers of fuel

Despite of many attempts to introduce a universal language, notable Esperanto and Idiom Neutral, the effort has met with very little success