Read the text below and think of the word which best fits each space

Read the text below and think of the word which best fits each space :
The reason (1)............. more and more people decide to learn English as a foreign (2) .................. is obvious : It is now the language used to in (3)............. every walk of life we can mention. Going to an international (4) ............... , we can hear all the flight announcements read (5).................. English. Switching on our TV to (6).......... a match between , say, Manchester United and Real Madrid, we immediately hear the commentator speak English. Taking (7).......... in a scientific seminar we surely find ourselves speaking English to (8)............ scientists. It is predicted (9)....... in quite a near future English will become the official language of (10).................... world.