根据单词的首字母及汉语提示补全单词。
(1)My sister is very c_________. She knows many things.
(2)My art teacher is not strict. He is very k_______.
(3)She often helps her mother do housework. She is very h_________.
(4)He is good at study, because he is h_________(辛勤的)
(5)Is he p________？（有礼貌的）