The boy knocked down by the car stood up all by himself , _____unhurt.

—Mom，dad is smoking again!—Well，let him cut it ________ gradually since old habits die hard.

History is the best teacher. It _______records the development path of each country and foretells the future to us.

(2013·江西，24)What a terrible experience！________，you're safe now—that's the main thing.

---Students should devote most of their time to studying rather than playing computer games.                                                       ---________.No pains, no gains.