Hit the books - To study, By the skin of your teeth - To barely make it, On the Ball - Quick to understand things, Find a needle in the haystack - Almost impossible to find, Sleep on it - To think about something for a while, Sit tight - To wait patiently, Up in the air - Things are not sure to happen, Piece of cake - Very easy, Twist someone´s arm - Convince someone, Break a leg - Good luck!,

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