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