What does the simile “they boy is as sharp as a tack” mean?

Do amazon give you real apple products

Match each type of troublesome language with its correct description

Sign wet paint when you see this sign, what will you say to other people that is going to sit? a. you must stay away from the area because it is under construction. b. you must not sit on the bench, so just stay away from it. i’m just not sure which one is correct