根据中文意思选择合适的词填空。

His brother is _______________ (能干的) at home.
Is Sarah ________________(有礼貌的) ？
Our head teacher isn’t ______________(老的). He is young.
The girl is __________________(羞怯的) at school.
He is _____________ ( 聪明的)
They are _________________ (勤奋的)