Each chemical element is characterized to the number of protons that an atom of that element contains, called it atomic number.

Ocean currents that help transfer heat from the equator to the poles, thereby creating a more balanced global environment.

Somehow without my noticing, my wallet had been disappeared

Jobs which are highly paid in some countries are badly paid in other.

In the United State, the Cabinet consist of a group of advisers, each of whom is chosen by the President to head an executive department of the government.

The number of student attending English courses at our university are increasing.

When Cliff was sick with the flu, his mother made him to eat chicken soup and rest in bed

By the end of the month, I’ll be working for this firm for a year.

Choose the correct answer to complete the sentence. "Twenty per cent of all the birds in the world ______ in the rainforest"

It is a common knowledge that Douglas intends to retire at the end of the season

Scientists are still uncertain of what the universe originated millions of years ago

Deciduous trees are ones that lose its leaves in the autumn and grow new ones in the spring.

Choose the correct answer to complete the sentence. "This process of cutting down trees is ______ ‘deforestation'"

Nylon, a synthetic done from a combination of water, air and a by product a coal, was first introduced in 1938

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

In 1991, Antonia Novello, the Unites States Surgeon General launched several programs to address particular problem that young people have

Air pollution, together with littering, are causing many problems in our large, industrial cities today.

The columnist feels sure that who wins the election will have the support of both parties

Dinosaurs are traditionally classified as cold-blooded reptiles, but recent evidence based on eating habits, posture, and skeletal structural suggests some may have been warm-blooded.

Gothic Revival architecture has several basic characteristics that distinguish it from other nineteenth-century architectural styles

When I was a secretary, the boss often made me to stay in the office in the evenings.