sepulchre - burial place or burial chamber
In the sentence it says that "Thou shalt lie down with patriarchs of the infant world-with kings, the powerful of the earth". It is describing laying down in death buried with kings who have long since passed.
musings - reflection or thought
It says that she hears his "musings, with a mild and healing sympathy". Reflection or thought is the best choice because he is telling her his darker thoughts.
mirth - amusement or merriment
This is the best choice since the person is described as leaving these thing s behind to go to their bed, or resting place.
Communion - close relationship with someone or something
It talks about how he has a love of nature and communes with nature meaning that he has a close relationship with it. People also take communion at church as a way to be closer to God.
