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

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

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Idiom
To put one's hand to plough

To take a difficult task
Take interest in technical work
None of these
To take up agricultural farming
To get entangled into unnecessary things

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Idiom
To wash one's dirty linen in public

To do some ugly work in public
To quarrel in the open
To discuss dirty and scandalous matters of personal nature in the presence of strangers
To criticise one's nature in public

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