I havent played it for a while, but as recal, they were:
'Your tiny hand is frozen' from La Boheme, by Puccini.
The aria when sending Cheribino off to war from 'The Marriage of Figaro' by Mozart.
An aria from La Traviata by Verdi (was it Toredor's march?)
And 'Nessun Dorma' from Turandot by Puccini.