阅读下面材料，在空白处填入适当的内容(不多于3个单词)或括号内单词的正确形式。
In order to know a foreign language thoroughly, four things are necessary. Firstly, we must understand the language when we hear     spoken. Secondly, we must be able to speak it correctly with confidence and without hesitation.     ,we must be able to read the language , and fourthly, we must be able to write it. We must be able to make sentences that are grammatically correct.
There is no easy way to succeed       learning a language.   good memory is of great help, but it is not enough only     (memorize) rules from a grammar book. It is not much use learning by heart long list of    (word) and their meaning, studying the dictionary and so on. We must learn by using the language. If we are      (satisfy)with only a few rules we have memorized, we are not really learning the language. “Learn through use” is a good piece of    (advise) for those   are studying a new language. Practice is important. We must practise speaking and    (write) the language whenever we can.