Questão 2421686

Which is the correct way to complete the paragraph below?

No language is easy to learn well, though languages which are related to our first language are _____. Learning a completely different writing system is a huge challenge, but that does not necessarily make a language _________ another. In the end, it is impossible to say that there is one language that is ____ language in the world.

_{(Adapted from www.usingenglish.com)}