Because of its vast tracts of virtually uninhabited northern forest, Canada has one of the lowest population density in the world

A fragrant plant has tiny sacs that makes and stores the substances that give it a pleasant odor.

Hoover Dam in Nevada is a multi purpose structure that provides flood control, hydroelectric powerful, and drinking and irrigation water

Lawrence Robert Klein received the 1980 Nobel Prize in economics for pioneering the useful of computers to forecast economic activity

The function of pain is to warn the individual of danger, so he can take action to avoid more serious damage

Can I borrow your scissors? Mine …….not sharp enough.

Most countries depend to few extent on cereal imports to augment their own crops.

By studying the fossils of pollen, which extremely resistant to decay, researchers can gain useful information about the vegetation of the past

David is talking to his friend, _    ?

..................United States is ...................world's biggest consumer of energy. 

Mosquitoes will accepts the malaria parasite at only one stage of the parasite’s complex life cycle.

The patient who was not supposed to be released until the end of the week was told to dress in clothes and report to the nurses’ station.

This ticket doesn't cost a lot, _    ?

Florida, named by the Spanish exploration Ponce de Leon, is one of the fastest growing states in the United States.

Although usual living on or under rocks or on coral reefs, marine snails have been observed in a great various of habitats

Choose the correct answer to complete the sentence. "In the past, a lot of countries ______ having contributed to global warming"

Because silk is the strongest of all natural fibers, ranking in strong with the synthetic fiber nylon, its delicate look and fell are deceptive.

Choose the correct answer to complete the sentence. "They decided to cut down on carbon footprints _____they saw people suffer global warming consequences"

Agronomists study crop disease, selective breeding, crop rotation, and climatic factors, as well soil content and erosion.

A City University Professor reported that he discovers a vaccine which has been 80 % effective in reducing the instances of tooth decay among small children.

Since the computer was invented, the work of accountants have been simplified.