Answer:
Romeo is missing
Tybalt has sent a challenge to fight.
Mercutio wants to respond to Tybalt.
Step-by-step explanation:
Romeo is missing because they are asking where he is
Tybalt has sent a letter to fight because Benvolio said he has sent a letter to his father's house
Mercutio wants to respond because he is saying "Any man that can write may answer a letter" so he's saying he wants to answer it but Benvolio is saying Romeo will answer it.
Hope this Helps!