Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage.

English is the most important in the world today. A very large (1)________ of people understand and use English in many countries of the world. 

Indeed English is a very useful language. If we speak English we can go to any place or country we like. We shall not find it hard to (2) ________people understand what we want to say.

English also helps us to learn all kinds of subjects. Hundreds of books are published in English every day in many countries to teach people many useful things. The English language has, (3)__________, helped to spread ideas and knowledge to all the corners of the world. There is no subject that cannot be taught in English.

As English is used so much everywhere in the world, it has helped to make the countries in the world friendlier. The leaders of the world use English (4) ________one another. The English language has also helped to spread better understanding and friendship among countries of the world.

Lastly, a person who knows English is respected by people. It is for all these (5) ________that I want to learn English.

The leaders of the world use English (4) ________one another.