Read the aphorism. write injuries in dust, benefits in marble. what important idea does this aphorism from benjamin franklin's poor richard's almanack convey?

This aphorism means that “injuries” (which can be related to problems, disagreements, a harmful or painful situation) can be easily disappear just as dust do with a simple puff of air). On the other hand, the benefits you get by experiencing a conflict or a worrying situation will last for ever in the same way a craftsman caves into marble. All in all, people should look at the good  side of things rather than the negative ones.

Do not remeber the injuries, remeber the blessings

(4) "oh, i've got better plans than that," laughed kerry. "i've got four firecrackers and two model rockets. care to join me in the backyard? "

this is the correct answer because of one simple word. "backyard"