根据句意和汉语注释，写出单词的正确形式。
(1)After the exam, our teacher came into the classroom with a ____ （满意的）smile on his face.
(2)The little boy was thirty, so the old lady ____ （提供）him a glass of water.
(3)For your own ____ （安全）, remember not to drive after drinking.
(4)What a pretty gold ring! It was ____ （专门地）designed for her.
