— What do you think of your English teacher?— He is friendly to us although sometimes he l

问题补充：

— What do you think of your English teacher?

— He is friendly to us although sometimes he looks .

A. happy B. kind C. serious

答案：

解析：happy高兴的；kind 好心的；serious严肃的，严重的。句意：你认为你的英语老师怎么样？——尽管他有时看起来很严肃，但是他对我们很友好。故选C。