Most types of dolphins live at less twenty-five years, and some  species may reach 50 years of age

The very first night I was in Australia, I couldn’t have slept until early in the morning

If either of you take a vacation now, we won’t be able to finish this work.

Being the biggest expanse of brackish water in the world, the Baltic Sea is one of special interesting to scientists.

The intent of the Historical Society is to restore old buildings and the increase of interest in the history of the area .

A seismograph oscillation of the ground caused by seismic waves, vibrations that travel from its point of origin through the Earth or along its surface.

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

Exercising well is as important to your health as sleep and eating correctly.

Choose one word or phrase marked A, B, C, or D that best complete the preceding sentence:

I'll let you know__________ I come back.

Somehow without my noticing, my wallet had been disappeared.

Friends advise her to stop doing the housework because her old age.

He has hardly never given a more impressive performance than this .

What we need most _    computers.

Believed that Jack had got home safely, we felt relieved.

The vast majority of the world’s manganese is found in either South Africa but also the countries of the former Russian.

“Do you know that beautiful lady over there?” - “Yes, that’s Victoria. She’s ______in her group.”

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

Choose the letter A, B, C or D to complete the sentences

The most important historical relics found in Hanoi's Temple of Literature ________ the Stelae of Doctors.

When radio programs became popular, approximately around 1925, many people stopped attending movies.

Choose one word or phrase marked A, B, C, or D that best complete the preceding sentence:

 It is__________ to go swimming.

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

If the government doesn’t _____ global warming, more natural disasters will occur.