阅读下面短文，在空白处填入1个适当单词或括号内单词的正确形式。
In order to know a foreign language well, four things are necessary. Firstly, we must understand the language when we hear ___1___ spoken. Secondly, we must be able to speak it ourselves correctly with confidence and without hesitation. Thirdly, 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 ___2___ (be) grammatically correct.
There is no easy way to success ___3___ language learning. ___4___ good memory is a great help, but it is not enough only ___5___ (memorize) rules from a grammar book. It is not much use learning by heart long lists of words and their meanings, ___6___ (study) the dictionary and so on. We must learn by using the language.
___7___ 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 ___8___ (advise) for those ___9___ are studying a new language. Practice is important. We must practise speaking and ___10___ (write) the language whenever we can.
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