1. It is considered a global language or lingua franca.
=> (1): Today English is considered a global language or lingua franca.
2. They may meet lots of difficulties in the modern world.
=> (2): It is said that if you do not know and cannot use it well, you may meet lots of difficulties in the modern world. 
3. We can get information from different sources in English and attend courses in English.
=>(5):It is obvious that most of the important sources of information are now in English.
(7): If we know English well, we can attend quite a lot of online courses or go abroac to study. 
4. Yes, they do.
=> (8): Many universities in different countries offer courses in English even though it is not th native language.
5. Because they want to get a position with a top company, or their companies require them to do so.
=>. Therefore, in order to get a position with a top company, more and more people are learning English. Even local companies now requi their staff to know English.