请根据下面短文内容,在短文后面的四个选项中选择一个能填入空白处的最佳答案。
Every year students in many countries learn English. Some of these
students are children, __1__ students are young people. Why do all these people
want to learn__2__? It is not__3__to answer this question. Many boys and girls
learn English at school. It is one of their __4__. Many people learn English
because it is__5__in their work. Some young people learn English__6__their
higher studies because some of their books are__7__English. Other people learn
English because they want to __8__newspapers in English. Some people learn
English because they want to __9__ in the USA,
England or Australia.
English is very__10__in our life (生活).
1. A. all B. the other C. both D. other