In Act 1 Scene 5 of Romeo and Juliet, what important discovery does the audience make about Romeo's attitude to love?

In this scene, Romeo turns instantly. Romeo, who has up until this point been completely depressed that Rosaline will not go for him, lays eyes on Juliet for the first time and says:

Did my heart love till now? Forswear it, sight!
For I ne'er saw true beauty till this night.

He was saying these same sentiments about Rosaline a few moments before this. Therefore, love can come and go for him. He is a waverer, he changes, he is fickle. 

It also demonstrates how much Romeo is in love with the idea of having a girl to love. And, he is much led by his eyes. He has no idea who Juliet is, yet believes he has fallen in love based on looks alone. She could have a terrible character for all he knows. 

http://www.enotes.com/romeo-and-juliet/q-and-a/act-1-scene-5-we-make-an-important-discovery-366283

In Act 2 Scene 1 of Romeo and Juliet, why is the figure of Cupid, with his arrows and his blindfold, so appropriate to this play and what does he represent?

Cupid is so appropriate to the play as its central focus is oung love. His present state of being blindfolded signifies the blinding nature of their passionate love and provides an insight (or explanation) into their often rash, unconsidered actions.

http://www.enotes.com/romeo-and-juliet/q-and-a/act-2-scene-1-romeo-juliet-why-figure-cupid-with-366590

In Act 2 Scene 2, which of the two (Romeo or Juliet) seems more practical and sensible? Explain your answer.

Romeo begins to display signs of increasing maturity in this scene. His speeches are now in blank verse rather than the rhymed iambic pentameter evident in his earlier sonnets and couplets. Romeo is no longer the melancholy lover of Act I. Up to this point, Romeo has expressed his emotions in a traditional, colloquial style. His behavior has been notably antisocial — he preferred to submit to the misery of his own amorous failures.

Although Romeo has matured in the brief time since the beginning of the play, he remains somewhat immature when compared with Juliet — a pattern that recurs throughout their relationship. Although Juliet is only 13, she considers the world with striking maturity. As later acts reveal, her parents do not provide an emotionally rich and stable environment, possibly forcing Juliet to mature beyond her years.

http://www.enotes.com/romeo-and-juliet/q-and-a/act-2-scene-2-which-two-romeo-juliet-seems-more-367183

In the fifth line of Act 1 Scene 1, Sampson declares. "I strike quickly, being moved." How does this line suggest a key feature of this scene in Romeo and Juliet?

The Montague and Capulet families are feuding.  Unfortunately, they are two quick to fight, so the feud continues.

Gregory and Sampson are young and ready for a fight.  They do not care why they are fighting, they just know that they are affiliated with the Capulet family and therefore they are supposed to hate the Montague family.

But thou art not quickly moved to strike. (Act 1, Scene 1, p. 9)

Sampson notes that he is moved by a “dog of the house of Montague” (Act 1, Scene 1, p. 9).  This is the problem.  The Montagues and the Capulets are always ready to fight, so they keep killing one another and extending the feud.

This line does not only describe the scene, but the whole play.  The two families are feuding and will continue to feud until their strife is buried by their children’s death.

http://www.enotes.com/romeo-and-juliet/q-and-a/fifth-line-act-1-scene-1-sampson-declares-strikes-367905

How would you describe Benvolio's role in Act 3, Scene 1 of Romeo and Juliet? - Romeo and Juliet - Questions & Answers

Benvolio is generally a stabilizing force.  He tries to avoid fights.  In this scene, he is not successful.

In Act 3, Scene 1, Benvolio wants to go inside because it is hot.  He really wants to go inside to avoid any fights.  Mercutio teases him, thinking that he really does want to start a fight.

An I were so apt to quarrel as thou art, any man

should buy the fee simple of my life for an hour and a

quarter. (Act 3, Scene 1, p. 61)

Mercutio thinks it’s fun to talk about fighting, and Benvolio enters the conversation in a witty and good natured way.

Benvolio tries to warn Mercutio that Tybalt, a Capulet, has come in.  Mercutio says he doesn’t care, but there is soon an altercation.  Benvolio tries to stop it.

We talk here in the public haunt of men.

Either withdraw unto some private place(50)

And reason coldly of your grievances,

Or else depart. Here all eyes gaze on us. (Act 3, Scene 1, p. 61)

It doesn’t work.  Soon, Tybalt and Mercutio are fighting and Romeo tries to break up the fight.  His intervention causes Tybalt to kill Mercutio, and Romeo kills Tybalt.  This causes Romeo’s banishment.

http://www.enotes.com/romeo-and-juliet/q-and-a/how-would-you-describe-benvolios-role-act-3-scene-372409

Describe Paris's behavior towards Juliet in Act IV, Scene 1 of Romeo and Juliet. - Romeo and Juliet - Questions & Answers

Paris's behavior toward Juliet demonstrates that he is ready and willing to marry her the following Thursday. He addresses her as "my lady and my wife," and "love." He asks her not to deny that she loves him (which, of course, she does not) and seems excited about the prospect of marriage. When she makes a self-deprecating remark about her own face, he retorts, albeit somewhat playfully, that "Thy face is mine, and thou hast sland'red it." These comments seem presumptuous, perhaps, given that the audience knows that Juliet has been recently married to Romeo. But Paris does not know this, of course, and his professed love for Juliet is poignant as well as tragic. It highlights Juliet's dilemma, and the audience knows that a third player is now drawn into a scenario that will not end well.

http://www.enotes.com/romeo-and-juliet/q-and-a/act-4-scene-1-what-do-you-think-behaviour-paris-373989