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. Once in a blue moon

Once in a month
On rare occasions
Bi-weekly
Every now and then

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Idiom
At one's beck and call

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

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