To be a good teacher, you need some of the (36) of a good actor: you must be able to hold the attention and interest of your (37) ; you must be a clear speaker, with a good, strong, (38) voice; and you must be able to act what you are teaching, to make its meaning (39) comprehensible. Watch a good teacher, and you will see that he does not sit just (40) before his class: he stands the whole time he is teaching; he walks about, using his arms, hands and fingers to help him in his (41) . Listen to him, and you will hear the (42) , the quality and the musical note of his voice always changing (43) to what he is talking about. (44) .The actor has to speak words which he has learnt by heart; he has to repeat exactly the same words each time he is playing a certain part. Even his movements and the ways in which he uses his voice are usually fixed beforehand. (45) . 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 orders, and if they don’t understand something, they say so. (46) .