Idiom
It is no longer easy to strike gold in Shakespeare's research since much work has already been done on him.

Come across the word "gold"
Come across gold
Uncover or find a valuable line of argument or information
Hit a golden spot

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

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