They have made a substantial change; that means, they have made a(n)                    change.

As I have just had a tooth _____ , I am not allowed to eat or drink anything for three hours.

Choose the best answer A, B, C or D to complete the sentence.

Smartphones are a great example of the ____ of artificial intelligence.

Choose the best answer:
They'd like to spend the week-end at ________

Choose the correct answer in each sentence.

Among her many _____________   achievements, Dr. Ahn wrote sixteen books and served as editor for three major journals.

Those employees wishing to change departments. ............the company may send their inquiries to Mr. Alvarez.

 James is very interested in mathematics and _______ applications. 

Choose the best answer:
The two small companies are going to ……….. at the end of the year.

Choose the correct answer in each sentence.

Sales from the Plainlee Organics juice line has  __________  for less than 25 percent of the company’s total revenue.

Choose the best answer:
Today, the old couple has their family and friends their golden wedding anniversary.

Choose the best answer to complete each sentence

After a decade of economic liberalization, Vietnam has seen a dramatic rise in living _______ in urban areas.

I don’t know what to do with my old typewriter, but __________ away seems wasteful.

You can take ____of these two elective courses; they are ____ very interesting. 

Employees who have not yet registered on the new company website must do so .................

Prior to the economic reform, the country had experienced many years of a ______________   economy.

Researchers have ____ to the conclusion that your personality is affected by your genes.

Because of their size, few of our plumbing fixtures are .................... for indoor use.

Choose the correct answer in each sentence.

After examining the vehicle, the mechanic had  ______________  identified the reason why the engine lost power.

Choose the correct answer in each sentence.

A gate agent at the airport announced a flight  _____________  caused by severe weather at the destination.

....................  English fluently, we should practise speaking it whenever possible.

An endangered species is a species  ..........  population is so small that it is in danger of becoming extinct.