calm quiet still silent

He took a few deep breaths to calm himself down 他深深地吸了几口气，使自己平静下来。

Calm down and tell me what happened. 镇静一点，告诉我发生了什么事。

I’ll go and calm your angry brother. 我要去让你那生气的弟弟平静下来。

The excited girl quickly calm down. 那个激动的女孩很快就平静下来
Her voice was surprisingly calm. 好的声音出人意思料的平静
surprisingly英[sə'praɪzɪŋlɪ]美[sə'praɪzɪŋli] adv. 惊人地；出人意料地
Calm “平静的，沉着的”指人遇事不慌、心情动，也指大海风平浪静
You should keep calm even in the face of danger. 即使面对危险，他也应当保持镇静。

quiet “安静的，宁静的”指环境寂静或心里安静
His health turned better after a quiet holiday abroad.
在国外度过一个宁静的假期后，他的健康状况没有所好转
still“静止的，不动的”指没有动作或动作的状态。

Keep still when i take a photo of you. 我给你照相时不要动
silent“寂静的，沉默的，不出声的”指人没有声音或不讲话
He was silent for a moment, and the began his answer. 他沉默了一会儿，然后开始回答
calmly 英['kɑːmlɪ]美['kɑmli] adv. 冷静地；平静地；安静地calmly discuss 平心静气地讨论Calmness 英['ka:mnis]美['ka:mnis] n. 冷静，镇静；平静，安宁
keep calm 保持镇静,保持冷静, Keep a calm 保持一颗平常心
remain calm 保持冷静
When facing danger, you should remain calm; when someone takes photos of you, you should stay still; when someone else is asleep, you should keep quiet; when in class, you should not keep silent about the teachers’ questions.
面对危险时，你应该保持镇静；照相时，你要保持不动；当别人睡觉时，你应该保持安静；在课堂上，对老师的问题你不应该保持地沉默。

1.She tired to _ the frightened boy, but failed. 他想让男孩平静下来，但并没做到。

A.lood down
B. calm down
C.get down
D.go down
2.The child was crying, so the nurse had got to give him some candies to __him_
A. Let; dow
B. put,down C write,down D.calm,down
Look down 往下看，蔑视go down 下降，沉下去
get down 下来，写下calm down 使...平静
Let...down使..失望，辜负（别人的信任和期望）write..down 写下，记下put..down 放下，写下，记下；镇压calm..down 使平静。