PUT ON YOUR THINKING CAP - She told her students to put on their thinking caps before answering questions., NO-BRAINER - That last test question was a complete no-brainer., ONE-TRACK MIND - Brian's had a one-track mind since he started his own company., PICK SOMEONE'S BRAIN - You should pick John's brain sometime., KEEP AN OPEN MIND - It's important to keep an open mind as you study the topic.,

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