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 theirexcitement (excite).
【小题2】He es from the southern (south) city of China.
【小题3】Jim is happy to live on the twelfth (twelve) floor because he enjoys the view out of the windows.
【小题4】Mr. and Mrs. Wang will celebrate their fifteen years of marriage (marry) this weekend．
【小题5】The water in the river isharmless (harm). You can drink it without cooking.
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解析：
【小题1】考查名词的用法。形容词性物主代词their后跟名词。故填excitement。
【小题2】考查词性转换。southern“南部的，南方的”。在此修饰名词city。故填southern。
【小题3】考查序数词。twelve的序数词形式是twelfth。第十二层是the twelfth floor。故填twelfth。
【小题4】考查词性转换。marry“结婚”，名词形式是marriage。故填marriage。
【小题5】考查形容词的用法。Is是系动词，后跟形容词作表语。根据句意可知，应填“无害的”。故填harmless。