Please Correct my Paragraph

I have used below four words in my paragraph.

Chorus, Cordially, Courtesy, Envisage.

Please help me to correct it.

"I liked chorus part of play in which all children stood up and showed their courtesy for their teachers and sang a song. They cordially invited each teacher on stage and gave a gift as momentum. No one had envisaged wonderful performance form children when they entered in the hall. "