根据已给出的首字母补全短文，每空一词。

Someone asks w____1 we learn English in China.   Because it is one of the world's m__2__ important languages and it is also widely used in the modern world. If you travel all over the world, you'll find English everywhere. It's widely used for business between different countries. And three quarters of the world's books and newspapers are w____3 in English. If you know English, you can en­joy so many good books. It's really a bridge to so much knowledge.

So we must do more listening ，speaking, r ____4 and writing.   If you work  hard on English, it's not d____5 to learn it well.

1. ________    2. ________    3. ________    4. ________    5. ________