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. He has been working on and off for several years on this research project.

rarely
at intervals
painstakingly
continuously

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Idiom
To put one's hand to plough

Take interest in technical work
To take up agricultural farming
None of these
To take a difficult task
To get entangled into unnecessary things

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