Most of the populations in the world speak these languages and the United Nations has decided that they are the languages this international organization works in. So, these languages differ in strength.
Fortunately, English is a language which has not encountered many problems to develop. The United States of America has done a great work by opening American Cultural centers where English is taught. This way students can study in American Universities. It is even English which has given America its popularity in the world. The music especially has made English the most liked language.
French is also popular because Paris is like the Center of the world. That is where fashion designers usually get a big audience. Paris is built on Island just like the Island of Manhattan where is New York City. There are boats that sail on the river Seine on which you can spend a week. They look like the boats in Holland which go through the canals.
Spanish is a language from Spain. This last country is an important place for tourism. There are places called Costa del Sol. The word sol means sun. Spain and Portugal had an important influence in Asia in Macau and the Philippines. One of the national dishes of Spain is Paella which is made of rice and sea food. Rice is the first produce from the Philippines which is also used in chemistry and pharmacy. It is from rice that the penicillin was invented.
Russian is the language spoken in Russia which is the biggest country in the world. Russia is known for its astronomic missions. The satellites of communications also exist thanks to the NASA in the States. Russia is always exploring new means in the areas of sciences. There are many mineral resources in Russia.
Chinese is from China. The country of the Forbidden City and of the big wall. The official Chinese is called mandarin. One will remember green tea which is a popular produce nowadays. The liver needs blood to keep on going. One of the rivers is even named the Red river which is the color of blood. There are many heavy rains called monsoon that happen in Asia. Rain is supposed to make the land more fertile but too much rain can also be bad for the quality.
Arabic is from Saudi Arabia. The capital for the Arabic language is Egypt where the pyramids where built long time ago. Arab is spoken in most oil producing countries. The coran was written in Arabic. So, because most of the Orientals are Muslim that is how they learn Arabic. The bible has been translated in many languages and it is one of the bestsellers in the world.
Thus, countries like Italy, Portugal, Brazil, and Asian countries have to decide which languages is their administrative languages among the international languages. Brazil is a multicultural country so it might be an exception to this rule with an addition to this that French is like the administrative language there. French is the language of noble families which make unions through exogamy and unite countries.