In big cities, the exhaust fumes build _________ and pose a health hazard to human beings.

In the past, the trip______ very rough and often dangerous, but things______ a great deal in the last hundred and fifty years 

When she got the news from her family, she could not do anything, ________ cry.

Choose the correct answer in each sentence.

Last year, the young chemists contributed  _______________  to the development of a new adhesive.

Choose the correct answer in each sentence.

By  ____________  to digital accounting, your business can save time, space, and money.

Choose the letter A, B, C or D to complete the sentence below
The Sahara is one …...…. the harshest environments on Earth, covering 3.6 million square miles (9.4 million square kilometers), nearly a third of the African continent.

Choose the sentence which has the closest meaning to the original one.

He can not afford a new computer.

Choose the best answer:
Though many scientific breakthroughs have resulted from mishaps it has taken brilliant thinkers to recognize their potential.

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Many people believe that the oil supply can rebound, _____________   the trend of reinvigorated growth that was seen in 2011.

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Simon ____________   informed the employee that his behavior would not be tolerated any longer.

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The Silvanus Museum staff is organizing a retirement party in honor of its  ________   director, who has served there for 25 years.

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The Trails Store will  ____________  add a section for hiking equipment.

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The phone survey overcomes some of the ------ of the mail survey but remains somewhat costly.

 You are allowed to go to the party  ................  you don’t stay out too late. Remember to be back here no later than 11.30 p.m.

Credits earned at junior colleges could be transferred to another institution  _______ students could complete their final years of college. 

Choose the best answer:

That’s .............! . I’m pleased that you work very hard.

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The friendly staff members at the Hotel Milo Surrey pride  _______  on the excellent customer service and expertise they offer clients.

The festival has many attractions. It will include contemporary orchestra music and an opera.  ................., there will be poetry readings and theatrical presentations.

A: “______________” - B: "You have to obtain the high school diploma."

 I'm sorry because I've lost the key to the drawer ................ all the important papers are kept.

Choose the correct answer in each sentence.

Ms. Carlton felt comfortable crossing the road because there were no vehicles comming in her ______.