根据句意和汉语注释，在答题卡标有题号的横线上，写出单词的正确形式：
(1)My brother sleeps with the window open (除非) it's really cold.
(2)We went back to the highway after the fog had (消失).
(3)There are (各种各样的) kinds of stationary for children to choose from.
(4)The problems are still under (讨论). Please wait for the results.
