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. His most trusted friend proved to be a snake in the grass.

cowardly and brutal
an unreliable and deceitful person
low and mean
a hidden enemy

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Idiom
To plough the sands

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

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