A thunder usually follows lightning by five seconds for every mile between the flash and the observer.

The ancestors of some French Americans originally came to The United State because of the French Revolution, that broke out in 1789

Early balloonists remained aloft in the air for relatively short periods .

Colleges in the newly formed United States, in recovering from the adverse effects of the American Revolution, inaugurated a broad curriculum in response of social demands.

The composer Verdi has written the opera Aida to celebrate the opening of the Suez Canal, but the opera was not performed until 1871 

Choose the correct answer to complete the sentence. "Global warming occurs when the greenhouse gases in the atmosphere trapthe heat_______ the sun"

In some species of fish, such the three-spined stickleback, the male, not the female, performs the task of caring for the young.

Would you show me ................... shortest way to …………. airport 

Since it lives in the desert, the collared lizard depends from insects for water as well as for food.

His roommate is not very clever student, but he certainly works very hard indeed

I wish you ______________ making that noise. It's bothering me. 

The most of the energy used in our homes and factories is generated from coal, oil and natural gas

President Wilson had hoped that World War I be the last great war, but only two decades later, the Second World War was erupting.

The word "increase” is closest in meaning to ____.

Because of the availability of trucks and easy access to modern highways, the locate of farms has become relatively unimportant with respect to their distance from markets.

After driving a car for ten miles, John suddenly realized that he has been driving in the wrong direction

Many small houses and huts were washed away when the river bursted its banks

“ This is not a good essay,” said the lecturer. “I find your arguments convince”.

The decade of the 1920’s was significant in Georgia’s history because of the rapidity with what agriculture declined in the state.

The National Basketball Association will not let any athlete to continue playing in league unless he submits voluntarily to treatment for drug addiction.

Because oak trees are highly resistant of storm damage, they usually live a long time