任务型阅读，阅读短文，然后根据其内容回答下列问题

　　To be a good teacher, you need some of the abilities of a good actor．You must be able to hold the attention and interest of your audience; you must be a clear speaker with a good, strong, pleasing voice which is fully(完全地)under your control; and you must be able to act what you are teaching in order to make your meaning clear．

　　Watch a good teacher, and you will see that he does not just sit before his class．He stands the whole time while teaching; he walks about, using his arms, hands and fingers(手指)to help him in his explanations, and his face to express(表达)feelings．Listen to him, and you will hear the loudness(大声)and the musical(悦耳的)note(调子)of his voice always changing according to(根据)what he is talking about．

　　The fact that a good teacher has some of the abilities of a good actor doesn't mean that he will really be able to act well on the stage, for there are very important differences between the teacher's work and the actor's．The actor has to speak words that he has learnt by heart(心); he has to repeat exactly(准确地)the same words each time he plays a certain part, even his movements and the ways in which he uses his voice are usually fixed(确定)before．What he has to do is to make all these carefully learnt words and actions seem natural on the stage．

　　A good teacher works in quite a different way．His audiences take an active part in his play．They ask and answer questions, they obey(遵守)orders(秩序), and if they don't understand something, they say so．The teacher therefore(因此)has to act according to the needs of his audiences-his class．He cannot learn his part by heart, but must invent it as he goes along．

　　I have known many teachers who were fine actors in class but were unable to take part in a stage play because they could not keep strictly to what others had written．

根据上面短文内容填空。

1．If you want to be a good teacher, you need some of the abilities of ________．

2．While teaching, a teacher uses his ________ to help him in his explanation, and his face to express ________．

3．Teachers’ work is quite ________ actors’．

4．An actor has to speak words that he has learned ________．

5．A teacher has to act according to ________．