For both excerpts, sing as the character and embody the character in your body language.
You may also be asked to cold read some lines so please try to be familiar with the personalities of the main male characters. Here are the descriptions from MTI's site:
Mr. Mushnik The seasoned owner of the failing East Side flower shop and Seymour's nosy boss. He is profit-driven, greedy, and manipulative. Gender: Male Age: 55 to 65 Vocal range top: F4 Vocal range bottom: G2
Voice Of The Plant An actor/vocalist located offstage. The voice is that of a conniving, street-smart 'villain.' A funky Rhythm and Blues voice is best. Gender: Male Age: 20 to 50 Vocal range top: G4 Vocal range bottom: G2
Seymour Krelborn An insecure, put-upon florist's clerk and eventual hero. He is a genuine, well-meaning man who is taken for granted because of his clumsy ways and poor social skills. Gender: Male Age: 25 to 35 Vocal range top: G4 Vocal range bottom: A2
Orin Scrivello An egotistical dentist with a passion for leather and sadistic tendencies. Audrey's abusive boyfriend, who is targeted by Seymour. Gender: Male Age: 30 to 40 Vocal range top: G4 Vocal range bottom: G2