If you ________ down something, you try to make people believe that it is not important.

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

On February 20th, 1962, “Friendship 7” orbiting the Earth in a manned flight that lasted just under five hours.

Nuclear powers production in the us is controlled by the Nuclear Regulatory Commission [NRC].

Left ­ hand traffic, a custom existing in Britain only, ..............back to the days when English people went to and fro on horseback.

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

When she retires in April 1989, football champion Christine Evert was the most famous man athlete in the United States.

Every society changes, but not change at the same rate or in the same direction.

The ozone layer must be protected because it shields the Earth from excessive ultraviolet radiations.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

________of my friends are very good at mathematics.

Choose the best answer:
What is his.............. ? Is he American or English?

It spent a short time to travel  the skiing resort but in the end, we go there.

It is believed that the more frequent you exercise, the greater physical endurance you will have.

 _    that she burst into tears.

The first things a new international student must do include renting an apartment, registering for classes, and to get to know the city.

Mark the letter A, B, C or D to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions:

Population growth rates vary among regions and even among countries within the same region.

The girl who were injured in the accident is now in hospital.

Identify the error in each sentence: Believed that Jack had got home safely, we felt relieved.

The way a child plays with other children reveals a lot about the child’s emotional development.

The biologist found some pollutants, a little of which can be considered very harmful to fish and other living organisms in the river.

On a ...........  of 1 to 10, in these subtropical desert regions the risk of desertification is according to the study.