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：

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：
小题1:My brother sleeps with the window open _______________ (除非) it’s really cold.
小题2:We went back to the highway after the fog had __________________ (消失).
小题3:There are _____________ (各种各样的) kinds of stationary for children to choose from.
小题4:The problems are still under ____________ (讨论). Please wait for the results.