Ozone is an unstable faintly bluish gas that is the most chemical active form of Oxygen.

To see the statue of Liberty and taking picture from the top of the Empire State Building are two reasons for visiting New York City.

My daughter is learning to play..................violin at .................. school. 

Interestingly, the United States both produces or uses more crude oil than any other nations

Geologists find it useful to identification fossils in a rock sample because certain assemblages of species are characteristic of specific geologic time periods

The prices of homes are as high in urban areas that most young people cannot afford to buy them 

What caused the explosion in the factory it is still unknown

The bodies of cold-blooded animals have the same temperature their surroundings, but those of warm-blooded animals do not.

Materials that of clay are among the most ancient manufactured articles and have played a vital role in human civilization.

Frank Lloyd Wright has been acclaimed by colleagues as the greater of all modern architects

Southern California, is known for its mild winters, has become the new home for many senior citizens escaping the hard Northern winters.

Her application for a visa was turned down not only because it was incomplete and incorrectly filled out but also because it was written in pencil.

After driving for twenty miles, he suddenly realized that he has been driving in the wrong direction.

Disease is not as widespread than before because of better preventive medicine and vastly improved nutrition.

The bold way in which Margaret Mead defined the terms “family” – based as much on choice as on biological relationship – is possibly the most enduring of her legacies

“Did you watch the football match late last night?” “ No, I didn’t, but I wish I ____.” 

Since the average age of families has fallen, therefore more and more women have been able to join the labor force

Choose the best option:

During a long drought, farmers had to find ways to ____ their crops.

Under the crust of the Earth are bubbling hot liquids that sometime rise to the surface.

Choose the correct answer to complete the sentence. " Carbon dioxide is one ---- the primary greenhouse gases that cause global warming."

Rita plays .......... violin and her sister plays .......... guitar.