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 am afraid the two brothers are at cross purposes.

are misunderstanding each other
quarrel with each other
dislike each other
are working against each other

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Idiom
To plough the sands

To work hard to achieve one's aim
To busy oneself in a way which cannot lead to any profitable result
To afford hope or ground for expecting a good result
To advance one's position in life

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