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 oil the knocker

To tip the office-boy
To instigate a person to do a job
To do a work with increased pace
To revive old enmity

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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. I raked my brains to solve this difficult problem.

I subjected my mind to hard thinking
I used my common sense
I read number of books
I brainwashed several experts
I consulted several people

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