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
Agro forestry is

None of these
Growing tree after cutting crop
Growing of tree with cultivation of crop in the same field
Growing tree for forest

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