I’m confused about this part of my homework. It’s about sentence fragments and sadly enough I don’t know much about it at all, could anyone help?

Read the passage: canines may not be the deepest thinkers in the world. but perhaps that's for the best. the life of a dog—sitting alone all day, waiting for everyone to come home—can be pretty boring. super-smart animals would probably get totally stressed out, says university of pennsylvania researcher james serpell. look at it this way: if dogs were any smarter, they probably wouldn't choose to hang around with us. which best describes the tone of the passage?

Select the correct text in the passage. which two lines in this excerpt from shakespeare's romeo and juliet foreshadow the tragic fate of romeo and juliet? friar laurence: so smile the heavens upon this holy act, that after hours with sorrow chide us not! romeo: amen, amen! but come what sorrow can, it cannot countervail the exchange of joy that one short minute gives me in her sight: do thou but close our hands with holy words, then love-devouring death do what he dare; it is enough i may but call her mine. friar laurence: these violent delights have violent ends and in their triumph die, like fire and powder, which as they kiss consume: the sweetest honey is loathsome in his own deliciousness and in the taste confounds the appetite: therefore love moderately; long love doth so; too swift arrives as tardy as too slow.

Read the passage and choose the correct punctuation marks