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. Despite the trust bestowed on the minister he turned out to be a snake in the grass during the revolution.

a secret enemy
an unforeseen danger
an unexpected misfortune
a treacherous person

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Idiom
To plough the sands

To advance one's position in life
To afford hope or ground for expecting a good result
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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