Solution The idiom 'your guess is as good as mine' is used when a person wants to say that he does not know something. Down for the count- tired. Up in arms- very angry. 1 is correct as it conveys how the speaker tells his friend that he does not know where the keys are. 2 is incorrect as it tells us how, because of a financial crisis, he had to search for a way that would help him earn enough to live. DOWN FOR THE COUNT (temporarily defeated) does not fit here grammatically. Instead, BACK AGAINST THE WALL (stuck in a difficult situation with no escape) should have been used. 3 is correct, as the sentence seeks to convey that the employees were very angry about the sudden change in the company's policy. Thus, C is the right answer.
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