Choose the correct answer to complete the sentence. "The Braille alphabet has been one of the _______ inventions in human history"

An electromagnet will remain magnetized only as longer as electricity flows through it .

Petroleum  is composed of cmplex mix of Hydrogen and Carbon.

I wish I had remembered your number. Otherwise, I ____ you. 

Choose the correct answer to each of the following questions."She doesn't want _____ the sites the way people around her do"

All nations may have to make fundamental changes their economic, political, and the technological institutions if they are to preserve environment.

When the Panic of 1857, some us citizens who had been rich or comfortable became poor while a few others, capitalizing economic shifts, became richer.

The word "perish"  is closest in meaning to ______.

Superior to all others woods for shipbuilding, teak also used for furniture, floorin, and general construction

If (A) we come homeon time, our step-mother will be angry.

Choose the best to complete the sentences: 

There are many other pursuits such as listening to music, reading, and gardening. 

The skin receives nearly the third of the blood pumped out by heart.

Mutualism is a lationship between animal species which in both benefit.

The ancient Romans used vessels equipped with sails and banks of oars transporting their armies

The ozone layer must protected because it shields the Earth from excessive ultraviolet radia

The authorities are worried about the increase of drum abuse .

I put my new book of zoology here on the desk a few minutes ago, but I cannot to find it.

Choose the letter A, B, C or D to complete the sentences. "We should replace fossil fuels ____________ other renewable fuels such as water, sun, etc."

Bus schedules are updated frequently,  ...........  check our website for the latest departure and arrival time.

Do you think what people have smoked less and less?

Mark the letter A, B, C or D on your answer sheet to indicate the word or phrase that is CLOSEST in meaning to the underlined part in each of the following questions: 

The newscaster gave a concise account of the strategy.