1) The top staff (lead vocals, 2 parts) will be sung by Deb R. and Chris on the top and Lynn and Sally on the bottom.  At mm. 33, the part is unison and goes up to a high E.  Sally, if this is too high, you don't have to sing it.
 
2) The second staff is for soprano and alto, so it's normal division until the line breaks into 3 parts.  At those times, the top goes to me, Linda O. and Laurel.  The middle goes to Fran, Deb H. and Julia.  The bottom goes to Sheri, Cheryl, and Melody.