"...Have all of the children look up D&C 18:34–36 [Senior Primary only will use the scriptures]. Ask them to listen and answer the question, 'Who else can hear the voice of our Heavenly Father?' Sing the final verse to find the answer. Point out that the last note of the song is different in the last verse. Have...three groups hold one tone to create a chord on the final 'Hear Him!' (A, C, F). At the end of the song, they will hear the beautiful harmony of the chord."
To help with the final note, I am going to pull out the A,C, F handbells and give one to 3 teachers who will be in charge of helping each group sing their note. Then we'll sing the whole 4th verse through with the 2nd ending and the 3 parts on the last note.
Then with these groups, I'm going to pass out strips of paper and have each group act out a verse we learned last week (1-3). The rest of the Primary will have to guess which verse they are depicting. I'll give each group about 3 minutes to put their act together (suggest to have extra kids be the scenery to involve more kids):
Group 1: Jesus getting baptized by John the Baptized
Group 2: Nephites see the Savior
Group 3: Joseph saw Heavenly Father and Jesus Christ as he knelt down to pray