Idiom
You have to be a cool customer and be patient if you want to get the best buys.

Be choosy
Have a cool head
Be calm and not be excitable
Be uncommunicative

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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 is in the habit of fishing in troubled waters.

putting others in trouble
taking advantage of troubled conditions for personal profit
aggravating the situation
indulging in evil conspirancies

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