If the world's tropical forests continue to disappear at their present rate, many animal species ____________ extinct. 

If you make a five-days trip across the Atlantic Ocean, your ship enters a different time zone everyday.

Many young people lack of the skills, good education, and finance to settle in the urban areas where most jobs are found.

After the team of geologists had drawn diagrams in their notebooks and wrote explanations of the formations which they had observed, they turned to their camp-side to compare notes.

For many years, scientists studying the effects that the sun has on human skin.

I am not related to this man in any way. He is neither a member of my family or a friend of mine .

.............AIDS is .................. incurable disease. 

They asked us, Henry and I , whether we thought that the statics had been presented fairly and accurately.

A dancing is the oldest and liveliest of the arts.

For many years, people have wondered that life exits elsewhere in the universe.

Hawaii’s eight major islands and numerous islets form the only state in the United States that is not lie on the mainland of North America.

Some of us have to study their lessons more carefully if we expect to pass this examination.

It is becoming extremely difficult to grow enough to feed the world’s rapidly increased population.

The native people of the Americans are called Indians because when Columbus landed in the Bahamas in 1492 , he thought that he has reached the East Indies.

Electric lamps came into widespread use during the early 1900’s and have replaced other type of fat gas, or oil lamps for almost every purpose.

From 1905 to 1920, American novelist Edith Wharton was at the height of her writing career, publishing of her three most famous novels.

The shore patrol has found the body of a man who they believe to be the missing marine biologist

I think she would forgive you if you ____ to speak to her. 

As you come to each town, however small, you will see a sign which states the name of the town and how many inhabitants does it have.

It was Vitus Bering, the Danish sea captain, who discovered Alaska on its voyage to Russia in 1741.

David is talking to his friend, _    ?