世界末日
Don't be so depressed. It's not Doomsday.

半斤八两
Tweedledum and Tweedledee：John is no better than Peter. They are just Tweedledum and Tweedledee. (six of one and half a dozen of the other)

半信半疑
half in doubt：A: Jimmy will invite you to dinner tonight? B: No, I don't think so. I will take it half in doubt. ( take with a grain of salt)

石沉大海
I couldn't find her. It seemed that her whereabouts sank into oblivion.

左右逢源
It appears that everything goes well with him.

司空见惯
order of the day：The situation is already order of the day. (par for the course)

目瞪口呆
She was already tongue-tied, and didn't know what to do. (lose one's tongue; struck dumb; stunned and speechless)

目光如豆
He is a person who sees no further than his nose.

出尔反尔
He is not a guy worthy of our trust. He often goes back on his word. (blow hot and cold)

出口成章
He is a learned person. His tongue is the pen of a ready writer.  

小Car笔记：

oblivion：遗忘，忘却  【常用词组】①pass into oblivion：渐为忘却，湮没无闻  ②bill of oblivion：大赦令
par for the course：意料之中的事，常有的事，司空见惯
blow hot and cold：朝三暮四，出尔反尔。【英英解释】to be favorable at one moment and adverse the next

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