1)
Why does the Torah insert the wirds "Titnu" (which is unusual) and "Terumah" (which is superfluous?
1.
Chulin, 132b: "Titeinu" comes to teach us that the Zero'a Besheilah of a Nazir, and "Terumah", the Zero'a (Lechayayim and Keivah) of Chulin too, must be given to a Kohen.
2)
Why is the right calf of the Yisrael's Shelamim given to the Kohanim?
1.
Seforno: It is akin to giving the king's servant a gift in honor of the king.
3)
Seeing as the Chazeh and the Shok are both a gift to the Kohen, why are they mentioned separately ? the Chazeh together with the Chalavim, the Shok independently?
1.
Ramban: Refer to 10:15:1:1*.