1.  This sentence tell us that we must pratise constantly if we need to master knowledge.

2.  Practice means that we are skilled to master much knowledge .

3.  Every student want to master the knowledge in soon, but, it is only a daydream.

4.  Then he think he has mastered accounting knowledge and get be able to be a accountant.

5.  You only master the knowledge of the job.

6.  Then we will really master the knowledge as long as we have the firm base.

7.  The purpose of us students to come to the school is to abtain knowledge, so it's important to master the knowledge .

8.  On writing and reading, we master the knowledge on books; on listening and speaking, we utilize language in our daily life .

9.  Fourthly the suitable exercises make us to master the knowledge we have learned .

10.  So we young people should learn and master knowledge, invent and improve our world.