I'am on d___today.I should clean the classroom根据首字母提示写出单词适当形式根据句子

I'am on d___today.I should clean the classroom根据首字母提示写出单词适当形式根据句子 I am keen on I am on the I am on i am on fto i am working on i am on it的意思请问I AM ON I am stuck on you! I am relying on you! i am down on my I am always on line I am tested on English. I am on the swim I am really gone on i am up on him I am going on the i am on cloud nice i am on line now