Pánis, quem égo dédero,
cáro méa est pro saéculi víta.
The bread that I shall give
Is my flesh, for the life of the world.
Here's the mp3 from the Benedictines of Brazil; here's the chant score:
The Offertory is In te speravi, from Psalm 31:14-15:
14 But I trusted in thee, O LORD: I said, Thou art my God.
15 My times are in thy hand: deliver me from the hand of mine enemies, and from them that persecute me.
Here's the mp3; here's the score: