用分词适当形式填空We must keep the things ______(discuss)now a secret

We must keep the things _discussed_____(discuss)now a secret.翻译下（我们要保持秘密讨论这件事,用过去分词）
She came into the room,__singing____(sing) a song.（伴随状语,所以用doing）
She sat at the desk ,___reading____(read) a novel.（同上）
_Being___(be) ill,he went home.（同上）