根据上下文的语法结构及所给提示填空，使短文连贯通顺。
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 success ______ language learning. _________ 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 words and __________meaning, studying the dictionary and so on. We must learn by using the language. ________we are satisfied 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.