根据短文内容, 用给出单词的适当形式填空。每词限用一次。

                                           listen, ask, think, learn, say, important, good, Japan, language, how

    There are more than 6,000 languages in the world. English is one of ____ languages. It is difficult ____ how many people are using it.

    Some English children study French. French is also a very important ____. Some other children study German, Russian, ____ and Chinese.

    Which is the best way to learn a foreign language? We know that we all learn our own language

     ____ when we are children. If we learn a second language in the same way, it won't seem so difficult. ____ does a small child hear his mother's tongue（语言）? He ____to what people say, and he tries to guess what he hears. When he wants something, he has to ____ for it, and he is using the language, ____ in it and talking in it all the time. If people use a second language all the time, they will ____ it quickly.