To start thinking carefully about something
Commencer à réfléchir sérieusement à quelque chose (commencer a reflechir serieusement a quelque chose)
"It’s time to put your thinking cap on for the quiz."
"Il est temps de se mettre à réfléchir pour le quiz." (il e tan de se mettre a reflechir pour le quiz)
the most advanced or innovative
to schedule or confirm something in writing
to be brave enough to have big ambitions
to experience the same unpleasantness you caused to others
too difficult to understand or achieve
to earn a large profit quickly