smother|smothered|smothering

他试图压抑自己的愤怒，保持冷静。

He tried to ___smother his anger and stay calm.

凶手用毯子闷死了受害者。

The murderer ___smothered the victim with a blanket.

她的祖母总是用过分关心来溺爱她，让她感到窒息。

Her grandmother is always ___smothering her with excessive care, making her feel suffocated.