There is a drinks reception on in Boston ______ (为欢迎所有与会者).

A good teacher (79) in quite a different way. His students take an active part in his (80) : they ask and answer questions; they obey orders; and if they don’t understand something, they will say so. The teacher therefore has to suit his act to the needs of his students. He cannot learn his part by heart, but must (81) it as he goes along.