根据要求完成句子(英语) 1、我有太多的家庭作业要做. I have ( )( )( )to do. 2、I don't know how I can do that.(改为同义句) I don't know ( )( )( )that. 3、尽管他很年轻,但是他会唱英文歌曲. Though he's very young,he ( )( )( )sing English songs.