sad的副詞形式怎么寫

　　Sadly, both he and my mother died of cancer

　　非常不幸的是，他和我母親都死于癌癥。

　　He'll be sadly missed. He was a real character.

　　人們會非常懷念他的，他可真是個有趣的人啊。

　　Sadly, the film is let down by an excessively simple plot.

　　遺憾的是，過于簡單的情節使得這部電影差強人意。

　　Sadly, most of the house was destroyed by fire in 1828.

　　遺憾的是，這座房屋在1828年的火災中大部分被燒毀。

　　Sadly, the project has now been shelved.

　　不幸的是，計劃現在已經擱淺。