根据句意和汉语提示，写出单词的正确形式。
小题1:On Children’s Day, children could not hide their______________(excite).
小题2:He comes from the _______________(south) city of China.
小题3:Jim is happy to live on the ____________ (twelve) floor because he enjoys the view out of the windows.
小题4:Mr. and Mrs. Wang will celebrate their fifteen years of ____________ (marry) this weekend．
小题5:The water in the river is______________(harm). You can drink it without cooking.