他深吸一口气，让自己冷静下来。

He took a deep breath and ___calmed himself down.

母亲的拥抱安抚了哭闹的婴儿。

The mother's hug ___calmed the crying baby.

热茶帮助缓解了她的紧张情绪。

The warm tea ___calmed her nervousness.