I'm having trouble solving this chorale. I'm given the soprano voice, I have to fill in the contralto, tenor and bass voices and indicate each scale degree used. The chorale is in G-sharp minor, which modulates to B major; the C in the second measure is the common chord (iv in G-sharp minor, ii in B major), a C chord.

I have no trouble filling in the second measure (ii - V - I, duh), but I can't seem to come up with a coherent progression to arrive at the C chord. Any help?
Wave goodbye to the past.
You've got your whole life to lead.

Fender 60's Lacquer Jazzmaster
Schecter C-1+ with SD '59
Egnater Tweaker 15
PolyTune noir
Algal Bloom fuzz
Fingerprint Redux fuzz
Nocturner reverb
Flashback delay
why are the stems of a soprano voice pointing down

anyway i don't want to give away the answer completely, but i jotted this down quickly and the hint i can give you is that i used a half-diminished seventh chord to get to the c#m chord

the first three should be fairly straightforward