A tornado is fed by warm, moist air in the atmosphere. The more warm, moist air there is, the longer the tornado can last. This phase of the tornado is referred to as its "mature" stage and can last from a few minutes to well over an hour. The word its refers to

Since smartphones have combined the tasks of previously separate devices into one exceptionally efficient product, their appeal to consumers cannot be overestimated. The word their refers to

When colonists from Europe traveled across the Atlantic to explore the New World, they never imagined what they would find, nor did they envision the devastation suffered by the native tribes of Americas because of diseases that they carried with them. The word "them" refers to

Horatio Algers, Jr. (1832-1899) was the author of more than 100 books for boys in the second half of nineteenth century; book that focused on the theme of success coming to those who work hard to achieve it. The word it refers to

As an author, Alger established a recurring theme in virtually all of his stories. Typically, he wrote about the poor and homeless children of the slums of New York City, seeing them as unfortunate pawns of the society, who, if only given the opportunity, could improve their lot. The word them refers to

Though his writing style was characterized by simplicity and repetition, it was at first well received by his target audience; his books were enormously popular, selling millions of copies well into the first few decades of the twentieth century. The word it refers to

Coral colonies require a series of complicated events and circumstances to develop into the characteristically intricate reef structures for which they are known. The word they refers to

The inhabitants of the Americas were separated from Asia, Africa, and Europe by rising oceans following the Ice Ages, and, as a result, they were isolated by means of this watery barrier from numerous virulent epidemic diseases that had developed across the Ocean, such as measles, smallpox, pneumonia and malaria. The word they in paragraph 2 refers to

Eventually, compassionate Europeans educated the native people and assisted them in finding better ways to combat the fatal infection, but not before the vast majority of them had been wiped out. The word them refers to

The La Brea tarpits, located in Hancock Park in the Los Angeles area, have proven to be an extremely fertile source of Ice Age fossils. Apparently, during the period of the Ice Age, the tarpits were covered by shallow pools of water, when animals came there to drink, they got caught in the sticky tar and perished. The word they refers to ...

Most chromium compounds have brightly colored hues, and as a result they are widely used as coloring agents, or pigments, in paints. In addition to having a pleasing color, a paint must protect the surface to which it is applied and be easy to apply in a thin, uniform coat. The word they refers to

Most chromium compounds have brightly colored hues, and as a result they are widely used as coloring agents, or pigments, in paints. In addition to having a pleasing color, a paint must protect the surface to which it is applied and be easy to apply in a thin, uniform coat. The word it refers to

Carnivorous plants, such as the sundew and the Venus-flytrap, are generally found in humid areas where there is an inadequate supply of nitrogen in the soil. In order to survive these plants have developed mechanisms to trap insects within their foliage. They have digestive fluids to obtain the necessary nitrogen from the insects. The pronoun "They" refers to

The United States does not have a national university, but the idea has been around for quite some time. George Washington first recommended the idea to Congress; he even selected an actual site in Washington, D.C. and then left an endowment for the proposed national university in his will. The word "he" refers to

Camp David, in a wooded mountain area about 70 miles from Washington, D.C., is where the president goes to find solitude. It consists of living space for the president, the first family, and the presidential staff as well as sporting and recreational facilities. The word "it" refers to

When Roosevelt first established the retreat, he called it Shangri-La, which evoked the blissful mountain kingdom in James Hilton's novel Lost Horizon. Later, President Dwight David Eisenhower renamed the location Camp David after his grandson David Eisenhower. The pronoun he refers to

When Roosevelt first established the retreat, he called it Shangri-La, which evoked the blissful mountain kingdom in James Hilton's novel Lost Horizon. Later, President Dwight David Eisenhower renamed the location Camp David after his grandson David Eisenhower. The pronoun his refers to

So while modern feature phones may still be behind in terms of capabilities of their smartphone contemporaries, they may in fact be more advanced than smartphones of just a few years ago. The word they refers to

For example, Angry Birds, one of the most popular apps on the market when it was created, was a game first devised for the Apple iPhone. Its enormous fame led to versions being devised for other smartphone operating systems, and then for other devices, such as computers and gaming consoles. The word "Its" refers to

The tar not only trapped the animals, leading to their death, but it also served as a remarkably effective preserve, allowing near-perfect skeletons to remain hidden until the present era. The word it refers to

Economic contact between Native Americans and Europeans can be traced back to the English and French fishermen off the coast of Canada in the 1500s. They traded guns and other weapons for beaver fur. The word "they" refers to

Pre-Columbian Americans had a relatively disease-free environment but also lacked the antibodies needed to protect them from bacteria and viruses brought to America by European explorers and colonist. The word "them" refers to

The furnishings are noticeably different from their modern counterparts.

The family that owns the house loaned its treasure to the library.

In the 1920s, a society woman created a dollhouse and Carrie Stettheimer’s artist friends contributed their talents to making it special.

Scuba divers are taught that (you, they) should check (your, their) equipment.

What do the italicised words refer to?

New Zealand is becoming an increasingly popular destination for overseas visitors. It attracts tourists and people on business, but the vast majority come as students.

What do the italicised words refer to?

New Zealand is becoming an increasingly popular destination for overseas visitors. It attracts tourists and people on business, but the vast majority come as students. Mostly from Asian countries, they stay for anything from a few weeks to a few years or more, studying at language schools, colleges and universities.

What do the italicised words refer to?

New Zealand can offer good homestay accommodation, a clean and beautiful environment and a reasonable cost of tuition. These factors attract an ever-increasing number of overseas students, accounting for millions of dollars in revenue for New Zealand.

What do the italicised words refer to?

"As companies unify their networks and systems, they must merge new technologies and legacy systems."

What do the italicised words refer to?

"Bill Gates knew that PCs would be big business and he imagined Microsoft playing a center role in this industry. "

What do the italicised words refer to?

"Today, telecommunication is widespread and devices that assist the process, such as the television, radio and telephone, are common in many parts of the world."

What do the italicised words refer to?

"There is no best answer to the question which online service is the best. Rating a particular online service over another is entirely subjective. Price is important to some people, while the number of files available for download is important to others."

What do the italicised words refer to?

"DELPHIE’s Hobby Shop is an online service which has two special-interest areas: one on classic vehicles and one on new cars and technology."

What do the italicised words refer to?

"Optical fibers give very clear telephone conversations which are free from signal interference because light signals from one fibre do not interfere with those of others in the same cable."

What do the italicised words refer to?

"Everybody uses computers for many different purposes. These smart machines make their lives easier and more pleasant."

What do the italicised words refer to?

"The Matrix is a cyber-thriller which captures the audience's attention from the beginning."

What do the italicised words refer to?

"I read in the newspapers that there are about 200 fires in American schools each year and more than half of them are started by boys under the age of 16."

Money in itself is harmless. It is but a medium of exchange in trade. It is the love for money that can lead to evil.