Idiom
For each of the following sentences four alternatives are given. You are required to choose the correct meaning of the idiom or phrase given or underlined in the sentence. To flog a dead horse

To act in a foolish way
To waste one's efforts
To revive old memories
To revise interest in an old subject

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Idiom
At one's beck and call

Enjoying oneself without caring for others
To be under one's subjugation
To be in an advantageous position
To be always at one's service

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